Ruby 2.1.0 fails to build 10.4 G3

02.make

	CC = /usr/bin/gcc-4.0
	LD = ld
	LDSHARED = /usr/bin/gcc-4.0 -dynamiclib
	CFLAGS = -Os -w -pipe -mcpu=750 -faltivec -mmacosx-version-min=10.4 -fno-common 
	XCFLAGS = -D_FORTIFY_SOURCE=2 -fvisibility=hidden -DRUBY_EXPORT
	CPPFLAGS = -I/usr/local/opt/openssl/include -I/usr/local/opt/readline/include -F/usr/local/Frameworks -I/usr/local/opt/openssl/include -D_XOPEN_SOURCE -D_DARWIN_C_SOURCE -D_DARWIN_UNLIMITED_SELECT -D_REENTRANT   -I. -I.ext/include/powerpc-darwin8.0 -I./include -I.
	DLDFLAGS = -Wl,-undefined,dynamic_lookup -Wl,-multiply_defined,suppress -install_name /usr/local/Cellar/ruby/2.1.0/lib/libruby.2.1.0.dylib -current_version 2.1.0 -compatibility_version 2.1.0  -Wl,-u,_objc_msgSend -framework CoreFoundation  -Wl,-u,_objc_msgSend -framework CoreFoundation  
	SOLIBS = -lpthread -lgmp -ldl -lobjc 
Using built-in specs.
Target: powerpc-apple-darwin8
Configured with: /var/tmp/gcc/gcc-5370~2/src/configure --disable-checking -enable-werror --prefix=/usr --mandir=/share/man --enable-languages=c,objc,c++,obj-c++ --program-transform-name=/^[cg][^.-]*$/s/$/-4.0/ --with-gxx-include-dir=/include/c++/4.0.0 --with-slibdir=/usr/lib --build=powerpc-apple-darwin8 --host=powerpc-apple-darwin8 --target=powerpc-apple-darwin8
Thread model: posix
gcc version 4.0.1 (Apple Computer, Inc. build 5370)
compiling main.c
compiling dmydln.c
compiling miniinit.c
compiling miniprelude.c
copying dummy probes.h
compiling array.c
compiling bignum.c
compiling class.c
compiling compar.c
compiling complex.c
compiling dir.c
compiling dln_find.c
compiling encoding.c
compiling enum.c
compiling enumerator.c
compiling error.c
compiling eval.c
compiling load.c
compiling proc.c
compiling file.c
compiling gc.c
compiling hash.c
compiling inits.c
compiling io.c
compiling marshal.c
compiling math.c
compiling node.c
compiling numeric.c
compiling object.c
compiling pack.c
compiling parse.c
compiling process.c
compiling random.c
compiling range.c
compiling rational.c
compiling re.c
compiling regcomp.c
compiling regenc.c
compiling regerror.c
compiling regexec.c
compiling regparse.c
compiling regsyntax.c
compiling ruby.c
compiling safe.c
compiling signal.c
compiling sprintf.c
compiling st.c
compiling strftime.c
compiling string.c
compiling struct.c
compiling time.c
compiling transcode.c
compiling util.c
compiling variable.c
compiling version.c
compiling compile.c
compiling debug.c
compiling iseq.c
compiling vm.c
compiling vm_dump.c
compiling vm_backtrace.c
compiling vm_trace.c
compiling thread.c
compiling cont.c
compiling ./enc/ascii.c
compiling ./enc/us_ascii.c
compiling ./enc/unicode.c
compiling ./enc/utf_8.c
compiling newline.c
compiling ./missing/setproctitle.c
compiling ./missing/alloca.c
compiling dmyext.c
linking miniruby
/usr/libexec/gcc/powerpc-apple-darwin8/4.0.1/ld: Undefined symbols:
___builtin_unreachable
_pthread_setname_np
collect2: ld returned 1 exit status
make: *** [miniruby] Error 1

HOMEBREW_VERSION: 0.9.5
HEAD: bb4e5d5b09cc36ac7b650de57026f60acb759b84
CPU: single-core 32-bit g3
OS X: 10.4.11-Power Macintosh
Xcode: 2.5
X11: 1.1.3 => /usr/X11R6

02.make with gcc4.2

	CC = /usr/local/bin/gcc-4.2
	LD = ld
	LDSHARED = /usr/local/bin/gcc-4.2 -dynamiclib
	CFLAGS = -Os -w -pipe -mcpu=750 -faltivec -mmacosx-version-min=10.4 -fno-common 
	XCFLAGS = -D_FORTIFY_SOURCE=2 -fno-strict-overflow -fvisibility=hidden -DRUBY_EXPORT
	CPPFLAGS = -I/usr/local/opt/openssl/include -I/usr/local/opt/readline/include -F/usr/local/Frameworks -I/usr/local/opt/openssl/include -D_XOPEN_SOURCE -D_DARWIN_C_SOURCE -D_DARWIN_UNLIMITED_SELECT -D_REENTRANT   -I. -I.ext/include/powerpc-darwin8.0 -I./include -I.
	DLDFLAGS = -Wl,-undefined,dynamic_lookup -Wl,-multiply_defined,suppress -install_name /usr/local/Cellar/ruby/2.1.0/lib/libruby.2.1.0.dylib -current_version 2.1.0 -compatibility_version 2.1.0  -Wl,-u,_objc_msgSend -framework CoreFoundation  -Wl,-u,_objc_msgSend -framework CoreFoundation  
	SOLIBS = -lpthread -lgmp -ldl -lobjc 
Using built-in specs.
Target: powerpc-apple-darwin8
Configured with: /Builds/apple/gcc_42-5553/build/obj/src/configure --disable-checking -enable-werror --prefix=/usr --mandir=/usr/share/man --enable-languages=c,objc,c++,obj-c++,fortran --program-transform-name=/^[cg][^.-]*$/s/$/-4.2/ --with-gxx-include-dir=/usr/include/c++/4.0.0 --with-slibdir=/usr/lib --build=i686-apple-darwin8 --program-prefix= --host=powerpc-apple-darwin8 --target=powerpc-apple-darwin8
Thread model: posix
gcc version 4.2.1 (Apple Inc. build 5553)
compiling main.c
compiling dmydln.c
compiling miniinit.c
compiling miniprelude.c
copying dummy probes.h
compiling array.c
compiling bignum.c
compiling class.c
compiling compar.c
compiling complex.c
compiling dir.c
compiling dln_find.c
compiling encoding.c
compiling enum.c
compiling enumerator.c
compiling error.c
compiling eval.c
compiling load.c
compiling proc.c
compiling file.c
compiling gc.c
compiling hash.c
compiling inits.c
compiling io.c
compiling marshal.c
compiling math.c
compiling node.c
compiling numeric.c
compiling object.c
compiling pack.c
compiling parse.c
compiling process.c
compiling random.c
compiling range.c
compiling rational.c
compiling re.c
compiling regcomp.c
compiling regenc.c
compiling regerror.c
compiling regexec.c
compiling regparse.c
compiling regsyntax.c
compiling ruby.c
compiling safe.c
compiling signal.c
compiling sprintf.c
compiling st.c
compiling strftime.c
compiling string.c
compiling struct.c
compiling time.c
compiling transcode.c
compiling util.c
compiling variable.c
compiling version.c
compiling compile.c
compiling debug.c
compiling iseq.c
compiling vm.c
compiling vm_dump.c
compiling vm_backtrace.c
compiling vm_trace.c
compiling thread.c
compiling cont.c
compiling ./enc/ascii.c
compiling ./enc/us_ascii.c
compiling ./enc/unicode.c
compiling ./enc/utf_8.c
compiling newline.c
compiling ./missing/setproctitle.c
compiling ./missing/alloca.c
compiling dmyext.c
linking miniruby
/usr/bin/ld: Undefined symbols:
___builtin_unreachable
_pthread_setname_np
collect2: ld returned 1 exit status
make: *** [miniruby] Error 1

HOMEBREW_VERSION: 0.9.5
HEAD: dcc9b23ffb671865c4f5638eef17d2e3aa4c4f32
CPU: single-core 32-bit g3
OS X: 10.4.11-Power Macintosh
Xcode: 2.5
X11: 1.1.3 => /usr/X11R6

output

theodore-waddells-powermacg3series:~ theodorewaddell$ brew doctor
Warning: The version of libcurl provided with Mac OS X 10.4 has outdated
SSL certificates.

This can cause problems when running Tigerbrew commands that use Git to
fetch over HTTPS, e.g. `brew update` or installing formulae that perform
Git checkouts.

You can force Git to ignore these errors:
  export GIT_SSL_NO_VERIFY=1
or
  git config --global http.sslVerify false
theodore-waddells-powermacg3series:~ theodorewaddell$ HOMEBREW_MAKE_JOBS=1 VERBOSE=1 brew upgrade ruby
==> Upgrading 1 outdated package, with result:
ruby 2.1.0
==> Upgrading ruby
rm /usr/local/bin/testrb
rm /usr/local/bin/ruby
rm /usr/local/bin/ri
rm /usr/local/bin/rdoc
rm /usr/local/bin/rake
rm /usr/local/bin/irb
rm /usr/local/bin/gem
rm /usr/local/bin/erb
rm /usr/local/include/ruby-2.0.0
rm /usr/local/lib/ruby/2.0.0
rm /usr/local/lib/pkgconfig/ruby-2.0.pc
rm /usr/local/lib/libruby.dylib
rm /usr/local/lib/libruby.2.0.dylib
rm /usr/local/lib/libruby.2.0.0.dylib
rm /usr/local/lib/libruby.2.0.0-static.a
rm /usr/local/share/man/man1/ruby.1
rm /usr/local/share/man/man1/ri.1
rm /usr/local/share/man/man1/rake.1
rm /usr/local/share/man/man1/irb.1
rm /usr/local/share/man/man1/erb.1
rmdir /usr/local/lib/ruby/site_ruby
rmdir /usr/local/lib/ruby/vendor_ruby
==> Downloading http://cache.ruby-lang.org/pub/ruby/2.1/ruby-2.1.0.tar.bz2
Already downloaded: /Library/Caches/Homebrew/ruby-2.1.0.tar.bz2
==> Verifying ruby-2.1.0.tar.bz2 checksum
/usr/bin/tar xjf /Library/Caches/Homebrew/ruby-2.1.0.tar.bz2
==> ./configure --prefix=/usr/local/Cellar/ruby/2.1.0 --enable-shared --with-out-ext=tk --disable-install-doc --with-opt-dir=/usr/local/opt/openssl
checking build system type... powerpc-apple-darwin8.11.0
checking host system type... powerpc-apple-darwin8.11.0
checking target system type... powerpc-apple-darwin8.11.0
checking whether the C compiler works... yes
checking for C compiler default output file name... a.out
checking for suffix of executables... 
checking whether we are cross compiling... no
checking for suffix of object files... o
checking whether we are using the GNU C compiler... yes
checking whether /usr/bin/gcc-4.0 accepts -g... yes
checking for /usr/bin/gcc-4.0 option to accept ISO C89... none needed
checking whether we are using the GNU C++ compiler... yes
checking whether /usr/bin/g++-4.0 accepts -g... yes
checking how to run the C preprocessor... /usr/bin/gcc-4.0 -E
checking for grep that handles long lines and -e... /usr/bin/grep
checking for egrep... /usr/bin/grep -E
checking whether /usr/bin/gcc-4.0 needs -traditional... no
checking for ld... ld
checking whether the linker is GNU ld... no
checking whether /usr/bin/gcc-4.0 -E accepts -o... yes
checking for real target cpu... powerpc
checking for ranlib... ranlib
checking for ar... ar
checking for as... as
checking for objdump... no
checking for gobjdump... no
checking for objcopy... no
checking for gobjcopy... no
checking for nm... nm
checking whether ln -s works... yes
checking whether make sets $(MAKE)... yes
checking for a BSD-compatible install... /usr/bin/install -c
checking for a thread-safe mkdir -p...  -d
use 'mkdir -p' as MKDIR_P
checking for dtrace... no
checking for dot... no
checking for doxygen... no
checking for pkg-config... pkg-config
checking for ANSI C header files... yes
checking for sys/types.h... yes
checking for sys/stat.h... yes
checking for stdlib.h... yes
checking for string.h... yes
checking for memory.h... yes
checking for strings.h... yes
checking for inttypes.h... yes
checking for stdint.h... yes
checking for unistd.h... yes
checking minix/config.h usability... no
checking minix/config.h presence... no
checking for minix/config.h... no
checking whether it is safe to define __EXTENSIONS__... yes
checking for cd using physical directory... cd -P
checking whether CFLAGS is valid... yes
checking whether LDFLAGS is valid... yes
checking whether -Wno-unused-parameter is accepted as CFLAGS... yes
checking whether -Wno-parentheses is accepted as CFLAGS... yes
checking whether -Wno-long-long is accepted as CFLAGS... yes
checking whether -Wno-missing-field-initializers is accepted as CFLAGS... yes
checking whether -Wunused-variable is accepted as CFLAGS... yes
checking whether -Wpointer-arith is accepted as CFLAGS... yes
checking whether -Wwrite-strings is accepted as CFLAGS... yes
checking whether -Wdeclaration-after-statement is accepted as CFLAGS... yes
checking whether -Wshorten-64-to-32 is accepted as CFLAGS... yes
checking whether -Wimplicit-function-declaration is accepted as CFLAGS... yes
checking whether -Wdivision-by-zero is accepted as CFLAGS... no
checking whether -Wextra-tokens is accepted as CFLAGS... yes
checking whether -Wall -Wextra is accepted as CFLAGS... yes
checking whether -D_FORTIFY_SOURCE=2 is accepted as CFLAGS... yes
checking whether -fstack-protector is accepted as CFLAGS... no
checking whether -fno-strict-overflow is accepted as CFLAGS... no
checking whether -ggdb3 is accepted as CFLAGS... yes
checking whether -fvisibility=hidden is accepted as CFLAGS... yes
checking whether -fno-fast-math is accepted as CFLAGS... yes
checking whether Mac OS X 10.5 or later... no
checking for broken crypt with 8bit chars... yes
checking for codesign... no
checking for crt_externs.h... yes
checking for crypt in -lcrypt... (cached) no
checking for dlopen in -ldl... yes
checking for shl_load in -ldld... no
checking for shutdown in -lsocket... no
checking for dirent.h that defines DIR... yes
checking for library containing opendir... none required
checking for stdbool.h that conforms to C99... yes
checking for _Bool... yes
checking for sys/wait.h that is POSIX.1 compatible... yes
checking limits.h usability... yes
checking limits.h presence... yes
checking for limits.h... yes
checking sys/file.h usability... yes
checking sys/file.h presence... yes
checking for sys/file.h... yes
checking sys/ioctl.h usability... yes
checking sys/ioctl.h presence... yes
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checking sys/syscall.h usability... yes
checking sys/syscall.h presence... yes
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checking fcntl.h usability... yes
checking fcntl.h presence... yes
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checking sys/fcntl.h usability... yes
checking sys/fcntl.h presence... yes
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checking sys/select.h usability... yes
checking sys/select.h presence... yes
checking for sys/select.h... yes
checking sys/time.h usability... yes
checking sys/time.h presence... yes
checking for sys/time.h... yes
checking sys/times.h usability... yes
checking sys/times.h presence... yes
checking for sys/times.h... yes
checking sys/param.h usability... yes
checking sys/param.h presence... yes
checking for sys/param.h... yes
checking syscall.h usability... no
checking syscall.h presence... no
checking for syscall.h... no
checking pwd.h usability... yes
checking pwd.h presence... yes
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checking grp.h usability... yes
checking grp.h presence... yes
checking for grp.h... yes
checking a.out.h usability... no
checking a.out.h presence... no
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checking utime.h usability... yes
checking utime.h presence... yes
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checking direct.h usability... no
checking direct.h presence... no
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checking sys/resource.h usability... yes
checking sys/resource.h presence... yes
checking for sys/resource.h... yes
checking sys/mkdev.h usability... no
checking sys/mkdev.h presence... no
checking for sys/mkdev.h... no
checking sys/utime.h usability... no
checking sys/utime.h presence... no
checking for sys/utime.h... no
checking float.h usability... yes
checking float.h presence... yes
checking for float.h... yes
checking ieeefp.h usability... no
checking ieeefp.h presence... no
checking for ieeefp.h... no
checking ucontext.h usability... yes
checking ucontext.h presence... yes
checking for ucontext.h... yes
checking intrinsics.h usability... no
checking intrinsics.h presence... no
checking for intrinsics.h... no
checking langinfo.h usability... yes
checking langinfo.h presence... yes
checking for langinfo.h... yes
checking locale.h usability... yes
checking locale.h presence... yes
checking for locale.h... yes
checking sys/sendfile.h usability... no
checking sys/sendfile.h presence... no
checking for sys/sendfile.h... no
checking time.h usability... yes
checking time.h presence... yes
checking for time.h... yes
checking net/socket.h usability... no
checking net/socket.h presence... no
checking for net/socket.h... no
checking sys/socket.h usability... yes
checking sys/socket.h presence... yes
checking for sys/socket.h... yes
checking process.h usability... no
checking process.h presence... no
checking for process.h... no
checking sys/prctl.h usability... no
checking sys/prctl.h presence... no
checking for sys/prctl.h... no
checking atomic.h usability... no
checking atomic.h presence... no
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checking malloc.h usability... no
checking malloc.h presence... no
checking for malloc.h... no
checking malloc_np.h usability... no
checking malloc_np.h presence... no
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checking malloc/malloc.h usability... yes
checking malloc/malloc.h presence... yes
checking for malloc/malloc.h... yes
checking setjmpex.h usability... no
checking setjmpex.h presence... no
checking for setjmpex.h... no
checking gmp.h usability... yes
checking gmp.h presence... yes
checking for gmp.h... yes
checking for __gmpz_init in -lgmp... yes
checking for special C compiler options needed for large files... no
checking for _FILE_OFFSET_BITS value needed for large files... no
checking whether byte ordering is bigendian... yes
checking for an ANSI C-conforming const... yes
checking whether char is unsigned... no
checking for inline... inline
checking for working volatile... yes
checking for long long... yes
checking for off_t... yes
checking char bit... 8
checking size of int... 4
checking size of short... 2
checking size of long... 4
checking size of long long... 8
checking size of __int64... 0
checking size of __int128... 0
checking size of off_t... 8
checking size of void*... 4
checking size of float... 4
checking size of double... 8
checking size of time_t... 4
checking size of clock_t... 4
checking for printf prefix for long long... ll
checking for pid_t... yes
checking for convertible type of pid_t... INT
checking for uid_t... yes
checking for convertible type of uid_t... UINT
checking for gid_t... yes
checking for convertible type of gid_t... UINT
checking for time_t... yes
checking for convertible type of time_t... LONG
checking for dev_t... yes
checking for convertible type of dev_t... INT
checking for mode_t... yes
checking for convertible type of mode_t... UINT
checking for rlim_t... yes
checking for convertible type of rlim_t... LL
checking for off_t... (cached) yes
checking for convertible type of off_t... LL
checking for clockid_t... no
checking for convertible type of clockid_t... INT
checking for prototypes... yes
checking token paste string... ansi
checking stringization... #expr
checking string literal concatenation... yes
checking for variable length prototypes and stdarg.h... yes
checking for variable length macro... yes
checking for noreturn function attribute... __attribute__ ((noreturn)) x
checking for deprecated function attribute... __attribute__ ((deprecated)) x
checking for noinline function attribute... __attribute__ ((noinline)) x
checking for stdcall function attribute... __attribute__ ((stdcall)) x
checking for cdecl function attribute... __attribute__ ((cdecl)) x
checking for fastcall function attribute... __attribute__ ((fastcall)) x
checking for function alias... no
checking for __atomic builtins... no
checking for __sync builtins... no
checking for __builtin_unreachable... yes
checking for exported function attribute... __attribute__ ((visibility("default")))
checking for function name string predefined identifier... __func__
checking whether sys_nerr is declared... yes
checking whether getenv is declared... yes
checking for size_t... yes
checking size of size_t... 4
checking size of ptrdiff_t... 4
checking for printf prefix for size_t... z
checking for printf prefix for ptrdiff_t... t
checking for struct stat.st_blksize... yes
checking for struct stat.st_blocks... yes
checking for struct stat.st_rdev... yes
checking size of struct stat.st_size... SIZEOF_LONG_LONG
checking size of struct stat.st_blocks... SIZEOF_LONG_LONG
checking for struct stat.st_atim... no
checking for struct stat.st_atimespec... yes
checking for struct stat.st_atimensec... no
checking for struct stat.st_mtim... no
checking for struct stat.st_mtimespec... yes
checking for struct stat.st_mtimensec... no
checking for struct stat.st_ctim... no
checking for struct stat.st_ctimespec... yes
checking for struct stat.st_ctimensec... no
checking for struct timeval... yes
checking size of struct timeval.tv_sec... SIZEOF_TIME_T
checking for struct timespec... yes
checking for struct timezone... yes
checking for clockid_t... (cached) no
checking for fd_mask... yes
checking for int8_t... yes
checking size of int8_t... 1
checking for uint8_t... yes
checking size of uint8_t... 1
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checking size of int16_t... 2
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checking size of uint16_t... 2
checking for int32_t... yes
checking size of int32_t... 4
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checking size of uint32_t... 4
checking for int64_t... yes
checking size of int64_t... 8
checking for uint64_t... yes
checking size of uint64_t... 8
checking for int128_t... no
checking for uint128_t... no
checking for intptr_t... yes
checking size of intptr_t... 4
checking for uintptr_t... yes
checking size of uintptr_t... 4
checking for ssize_t... yes
checking size of ssize_t... 4
checking for stack end address... no
checking for uid_t in sys/types.h... (cached) yes
checking type of array argument to getgroups... (cached) gid_t
checking return type of signal handlers... void
checking for working memcmp... yes
checking for broken erfc of glibc-2.3.6 on IA64... no
checking for dup2... yes
checking for memmove... yes
checking for strerror... yes
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checking for crypt... yes
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checking for finite... yes
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checking for hypot... yes
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checking for cbrt... yes
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checking for ffs... yes
checking for setproctitle... no
checking sys/pstat.h usability... no
checking sys/pstat.h presence... no
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checking for signbit... yes
checking for __syscall... no
checking for _longjmp... yes
checking for _setjmp... yes
checking for _setjmpex... no
checking for chroot... yes
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checking for clock_gettime... no
checking for cosh... yes
checking for daemon... (cached) no
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checking for dlopen... yes
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checking for fcntl... yes
checking for fdatasync... (cached) no
checking for fmod... yes
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checking for ftruncate... yes
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checking for getcwd... yes
checking for getgrnam_r... yes
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checking for getpgid... yes
checking for getpgrp... yes
checking for getpriority... yes
checking for getpwnam_r... yes
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checking for gettimeofday... yes
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checking for issetugid... yes
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checking for lstat... yes
checking for malloc_usable_size... no
checking for malloc_size... yes
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checking for mktime... yes
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checking for pread... yes
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checking for seekdir... yes
checking for select_large_fdset... no
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checking for setegid... yes
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checking for seteuid... yes
checking for setgid... yes
checking for setgroups... yes
checking for setpgid... yes
checking for setpgrp... yes
checking for setregid... yes
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checking for setreuid... yes
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checking for setrlimit... yes
checking for setruid... yes
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checking for shutdown... yes
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checking for __builtin_bswap32... no
checking for __builtin_bswap64... no
checking for __builtin_clz... yes
checking for __builtin_clzl... yes
checking for __builtin_clzll... yes
checking for __builtin_choose_expr... yes
checking for __builtin_types_compatible_p... yes
checking for clock_gettime in -lrt... no
checking for clock_getres... no
checking for unsetenv returns a value... yes
checking for sigsetjmp as a macro or function... yes
checking for __builtin_setjmp... no
checking for setjmp type... _setjmp
checking whether struct tm is in sys/time.h or time.h... time.h
checking for struct tm.tm_zone... yes
checking for struct tm.tm_gmtoff... yes
checking for external int daylight... yes
checking for external timezone... long
checking for external altzone... no
checking for timezone... yes
checking whether timezone requires zero arguments... yes
checking for negative time_t for gmtime(3)... yes
checking for localtime(3) overflow correctly... yes
checking whether right shift preserve sign bit... yes
checking read count field in FILE structures... _r
checking read buffer ptr field in FILE structures... _p
checking size of struct stat.st_ino... SIZEOF_LONG
checking whether _SC_CLK_TCK is supported... yes
checking stack growing direction on powerpc... -1
checking for pthread_kill in -lthr... no
checking for pthread_kill in -lpthread... yes
checking for pthread_np.h... no
checking for sched_yield... yes
checking for pthread_attr_setinheritsched... yes
checking for pthread_getattr_np... no
checking for pthread_attr_get_np... no
checking for pthread_attr_getstack... yes
checking for pthread_get_stackaddr_np... yes
checking for pthread_get_stacksize_np... yes
checking for thr_stksegment... no
checking for pthread_stackseg_np... no
checking for pthread_getthrds_np... no
checking for pthread_cond_init... yes
checking for pthread_condattr_setclock... no
checking for pthread_condattr_init... yes
checking for pthread_sigmask... yes
checking for pthread_attr_init... yes
checking for getcontext... no
checking for setcontext... no
checking if fork works with pthread... yes
checking whether ELF binaries are produced... no
checking whether OS depend dynamic link works... yes
checking execinfo.h usability... no
checking execinfo.h presence... no
checking for execinfo.h... no
checking for backtrace... no
checking valgrind/memcheck.h usability... no
checking valgrind/memcheck.h presence... no
checking for valgrind/memcheck.h... no
checking for strip... strip
checking whether -Wl,--no-undefined is accepted as LDFLAGS... no
checking for prefix of external symbols... _
checking pthread.h usability... yes
checking pthread.h presence... yes
checking for pthread.h... yes
checking if make is GNU make... yes
checking for memmem... no
checking for nroff... /usr/bin/nroff
.ext/include/powerpc-darwin8.0/ruby/config.h updated
ruby library version = 2.1.0
configure: creating ./config.status
config.status: creating GNUmakefile
config.status: creating Makefile
config.status: creating ruby-2.1.pc
==> make
        CC = /usr/bin/gcc-4.0
        LD = ld
        LDSHARED = /usr/bin/gcc-4.0 -dynamiclib
        CFLAGS = -Os -w -pipe -mcpu=750 -faltivec -mmacosx-version-min=10.4 -fno-common 
        XCFLAGS = -D_FORTIFY_SOURCE=2 -fvisibility=hidden -DRUBY_EXPORT
        CPPFLAGS = -I/usr/local/opt/openssl/include -I/usr/local/opt/readline/include -F/usr/local/Frameworks -I/usr/local/opt/openssl/include -D_XOPEN_SOURCE -D_DARWIN_C_SOURCE -D_DARWIN_UNLIMITED_SELECT -D_REENTRANT   -I. -I.ext/include/powerpc-darwin8.0 -I./include -I.
        DLDFLAGS = -Wl,-undefined,dynamic_lookup -Wl,-multiply_defined,suppress -install_name /usr/local/Cellar/ruby/2.1.0/lib/libruby.2.1.0.dylib -current_version 2.1.0 -compatibility_version 2.1.0  -Wl,-u,_objc_msgSend -framework CoreFoundation  -Wl,-u,_objc_msgSend -framework CoreFoundation  
        SOLIBS = -lpthread -lgmp -ldl -lobjc 
Using built-in specs.
Target: powerpc-apple-darwin8
Configured with: /var/tmp/gcc/gcc-5370~2/src/configure --disable-checking -enable-werror --prefix=/usr --mandir=/share/man --enable-languages=c,objc,c++,obj-c++ --program-transform-name=/^[cg][^.-]*$/s/$/-4.0/ --with-gxx-include-dir=/include/c++/4.0.0 --with-slibdir=/usr/lib --build=powerpc-apple-darwin8 --host=powerpc-apple-darwin8 --target=powerpc-apple-darwin8
Thread model: posix
gcc version 4.0.1 (Apple Computer, Inc. build 5370)
compiling main.c
compiling dmydln.c
compiling miniinit.c
compiling miniprelude.c
copying dummy probes.h
compiling array.c
compiling bignum.c
compiling class.c
compiling compar.c
compiling complex.c
compiling dir.c
compiling dln_find.c
compiling encoding.c
compiling enum.c
compiling enumerator.c
compiling error.c
compiling eval.c
compiling load.c
compiling proc.c
compiling file.c
compiling gc.c
compiling hash.c
compiling inits.c
compiling io.c
compiling marshal.c
compiling math.c
compiling node.c
compiling numeric.c
compiling object.c
compiling pack.c
compiling parse.c
compiling process.c
compiling random.c
compiling range.c
compiling rational.c
compiling re.c
compiling regcomp.c
compiling regenc.c
compiling regerror.c
compiling regexec.c
compiling regparse.c
compiling regsyntax.c
compiling ruby.c
compiling safe.c
compiling signal.c
compiling sprintf.c
compiling st.c
compiling strftime.c
compiling string.c
compiling struct.c
compiling time.c
compiling transcode.c
compiling util.c
compiling variable.c
compiling version.c
compiling compile.c
compiling debug.c
compiling iseq.c
compiling vm.c
compiling vm_dump.c
compiling vm_backtrace.c
compiling vm_trace.c
compiling thread.c
compiling cont.c
compiling ./enc/ascii.c
compiling ./enc/us_ascii.c
compiling ./enc/unicode.c
compiling ./enc/utf_8.c
compiling newline.c
compiling ./missing/setproctitle.c
compiling ./missing/alloca.c
compiling dmyext.c
linking miniruby
/usr/libexec/gcc/powerpc-apple-darwin8/4.0.1/ld: Undefined symbols:
___builtin_unreachable
_pthread_setname_np
collect2: ld returned 1 exit status
make: *** [miniruby] Error 1

output with gcc4.2

theodore-waddells-powermacg3series:~ theodorewaddell$ HOMEBREW_MAKE_JOBS=1 VERBOSE=1 brew install ruby --cc=gcc-4.2
==> Downloading http://cache.ruby-lang.org/pub/ruby/2.1/ruby-2.1.0.tar.bz2
Already downloaded: /Library/Caches/Homebrew/ruby-2.1.0.tar.bz2
==> Verifying ruby-2.1.0.tar.bz2 checksum
/usr/bin/tar xjf /Library/Caches/Homebrew/ruby-2.1.0.tar.bz2
==> ./configure --prefix=/usr/local/Cellar/ruby/2.1.0 --enable-shared --with-out-ext=tk --disable-install-doc --with-opt-dir=/usr/local/opt/openssl
checking build system type... powerpc-apple-darwin8.11.0
checking host system type... powerpc-apple-darwin8.11.0
checking target system type... powerpc-apple-darwin8.11.0
checking whether the C compiler works... yes
checking for C compiler default output file name... a.out
checking for suffix of executables... 
checking whether we are cross compiling... no
checking for suffix of object files... o
checking whether we are using the GNU C compiler... yes
checking whether /usr/local/bin/gcc-4.2 accepts -g... yes
checking for /usr/local/bin/gcc-4.2 option to accept ISO C89... none needed
checking whether we are using the GNU C++ compiler... yes
checking whether /usr/local/bin/g++-4.2 accepts -g... yes
checking how to run the C preprocessor... /usr/local/bin/gcc-4.2 -E
checking for grep that handles long lines and -e... /usr/bin/grep
checking for egrep... /usr/bin/grep -E
checking whether /usr/local/bin/gcc-4.2 needs -traditional... no
checking for ld... ld
checking whether the linker is GNU ld... no
checking whether /usr/local/bin/gcc-4.2 -E accepts -o... yes
checking for real target cpu... powerpc
checking for ranlib... ranlib
checking for ar... ar
checking for as... as
checking for objdump... no
checking for gobjdump... no
checking for objcopy... no
checking for gobjcopy... no
checking for nm... nm
checking whether ln -s works... yes
checking whether make sets $(MAKE)... yes
checking for a BSD-compatible install... /usr/bin/install -c
checking for a thread-safe mkdir -p...  -d
use 'mkdir -p' as MKDIR_P
checking for dtrace... no
checking for dot... no
checking for doxygen... no
checking for pkg-config... pkg-config
checking for ANSI C header files... yes
checking for sys/types.h... yes
checking for sys/stat.h... yes
checking for stdlib.h... yes
checking for string.h... yes
checking for memory.h... yes
checking for strings.h... yes
checking for inttypes.h... yes
checking for stdint.h... yes
checking for unistd.h... yes
checking minix/config.h usability... no
checking minix/config.h presence... no
checking for minix/config.h... no
checking whether it is safe to define __EXTENSIONS__... yes
checking for cd using physical directory... cd -P
checking whether CFLAGS is valid... yes
checking whether LDFLAGS is valid... yes
checking whether -Wno-unused-parameter is accepted as CFLAGS... yes
checking whether -Wno-parentheses is accepted as CFLAGS... yes
checking whether -Wno-long-long is accepted as CFLAGS... yes
checking whether -Wno-missing-field-initializers is accepted as CFLAGS... yes
checking whether -Wunused-variable is accepted as CFLAGS... yes
checking whether -Wpointer-arith is accepted as CFLAGS... yes
checking whether -Wwrite-strings is accepted as CFLAGS... yes
checking whether -Wdeclaration-after-statement is accepted as CFLAGS... yes
checking whether -Wshorten-64-to-32 is accepted as CFLAGS... yes
checking whether -Wimplicit-function-declaration is accepted as CFLAGS... yes
checking whether -Wdivision-by-zero is accepted as CFLAGS... no
checking whether -Wextra-tokens is accepted as CFLAGS... yes
checking whether -Wall -Wextra is accepted as CFLAGS... yes
checking whether -D_FORTIFY_SOURCE=2 is accepted as CFLAGS... yes
checking whether -fstack-protector is accepted as CFLAGS... yes
checking whether -fstack-protector is accepted as LDFLAGS... no
checking whether -fno-strict-overflow is accepted as CFLAGS... yes
checking whether -ggdb3 is accepted as CFLAGS... yes
checking whether -fvisibility=hidden is accepted as CFLAGS... yes
checking whether -fno-fast-math is accepted as CFLAGS... yes
checking whether Mac OS X 10.5 or later... no
checking for broken crypt with 8bit chars... yes
checking for codesign... no
checking for crt_externs.h... yes
checking for crypt in -lcrypt... (cached) no
checking for dlopen in -ldl... yes
checking for shl_load in -ldld... no
checking for shutdown in -lsocket... no
checking for dirent.h that defines DIR... yes
checking for library containing opendir... none required
checking for stdbool.h that conforms to C99... yes
checking for _Bool... yes
checking for sys/wait.h that is POSIX.1 compatible... yes
checking limits.h usability... yes
checking limits.h presence... yes
checking for limits.h... yes
checking sys/file.h usability... yes
checking sys/file.h presence... yes
checking for sys/file.h... yes
checking sys/ioctl.h usability... yes
checking sys/ioctl.h presence... yes
checking for sys/ioctl.h... yes
checking sys/syscall.h usability... yes
checking sys/syscall.h presence... yes
checking for sys/syscall.h... yes
checking fcntl.h usability... yes
checking fcntl.h presence... yes
checking for fcntl.h... yes
checking sys/fcntl.h usability... yes
checking sys/fcntl.h presence... yes
checking for sys/fcntl.h... yes
checking sys/select.h usability... yes
checking sys/select.h presence... yes
checking for sys/select.h... yes
checking sys/time.h usability... yes
checking sys/time.h presence... yes
checking for sys/time.h... yes
checking sys/times.h usability... yes
checking sys/times.h presence... yes
checking for sys/times.h... yes
checking sys/param.h usability... yes
checking sys/param.h presence... yes
checking for sys/param.h... yes
checking syscall.h usability... no
checking syscall.h presence... no
checking for syscall.h... no
checking pwd.h usability... yes
checking pwd.h presence... yes
checking for pwd.h... yes
checking grp.h usability... yes
checking grp.h presence... yes
checking for grp.h... yes
checking a.out.h usability... no
checking a.out.h presence... no
checking for a.out.h... no
checking utime.h usability... yes
checking utime.h presence... yes
checking for utime.h... yes
checking direct.h usability... no
checking direct.h presence... no
checking for direct.h... no
checking sys/resource.h usability... yes
checking sys/resource.h presence... yes
checking for sys/resource.h... yes
checking sys/mkdev.h usability... no
checking sys/mkdev.h presence... no
checking for sys/mkdev.h... no
checking sys/utime.h usability... no
checking sys/utime.h presence... no
checking for sys/utime.h... no
checking float.h usability... yes
checking float.h presence... yes
checking for float.h... yes
checking ieeefp.h usability... no
checking ieeefp.h presence... no
checking for ieeefp.h... no
checking ucontext.h usability... yes
checking ucontext.h presence... yes
checking for ucontext.h... yes
checking intrinsics.h usability... no
checking intrinsics.h presence... no
checking for intrinsics.h... no
checking langinfo.h usability... yes
checking langinfo.h presence... yes
checking for langinfo.h... yes
checking locale.h usability... yes
checking locale.h presence... yes
checking for locale.h... yes
checking sys/sendfile.h usability... no
checking sys/sendfile.h presence... no
checking for sys/sendfile.h... no
checking time.h usability... yes
checking time.h presence... yes
checking for time.h... yes
checking net/socket.h usability... no
checking net/socket.h presence... no
checking for net/socket.h... no
checking sys/socket.h usability... yes
checking sys/socket.h presence... yes
checking for sys/socket.h... yes
checking process.h usability... no
checking process.h presence... no
checking for process.h... no
checking sys/prctl.h usability... no
checking sys/prctl.h presence... no
checking for sys/prctl.h... no
checking atomic.h usability... no
checking atomic.h presence... no
checking for atomic.h... no
checking malloc.h usability... no
checking malloc.h presence... no
checking for malloc.h... no
checking malloc_np.h usability... no
checking malloc_np.h presence... no
checking for malloc_np.h... no
checking malloc/malloc.h usability... yes
checking malloc/malloc.h presence... yes
checking for malloc/malloc.h... yes
checking setjmpex.h usability... no
checking setjmpex.h presence... no
checking for setjmpex.h... no
checking gmp.h usability... yes
checking gmp.h presence... yes
checking for gmp.h... yes
checking for __gmpz_init in -lgmp... yes
checking for special C compiler options needed for large files... no
checking for _FILE_OFFSET_BITS value needed for large files... no
checking whether byte ordering is bigendian... yes
checking for an ANSI C-conforming const... yes
checking whether char is unsigned... no
checking for inline... inline
checking for working volatile... yes
checking for long long... yes
checking for off_t... yes
checking char bit... 8
checking size of int... 4
checking size of short... 2
checking size of long... 4
checking size of long long... 8
checking size of __int64... 0
checking size of __int128... 0
checking size of off_t... 8
checking size of void*... 4
checking size of float... 4
checking size of double... 8
checking size of time_t... 4
checking size of clock_t... 4
checking for printf prefix for long long... ll
checking for pid_t... yes
checking for convertible type of pid_t... INT
checking for uid_t... yes
checking for convertible type of uid_t... UINT
checking for gid_t... yes
checking for convertible type of gid_t... UINT
checking for time_t... yes
checking for convertible type of time_t... LONG
checking for dev_t... yes
checking for convertible type of dev_t... INT
checking for mode_t... yes
checking for convertible type of mode_t... UINT
checking for rlim_t... yes
checking for convertible type of rlim_t... LL
checking for off_t... (cached) yes
checking for convertible type of off_t... LL
checking for clockid_t... no
checking for convertible type of clockid_t... INT
checking for prototypes... yes
checking token paste string... ansi
checking stringization... #expr
checking string literal concatenation... yes
checking for variable length prototypes and stdarg.h... yes
checking for variable length macro... yes
checking for noreturn function attribute... __attribute__ ((noreturn)) x
checking for deprecated function attribute... __attribute__ ((deprecated)) x
checking for noinline function attribute... __attribute__ ((noinline)) x
checking for stdcall function attribute... __attribute__ ((stdcall)) x
checking for cdecl function attribute... __attribute__ ((cdecl)) x
checking for fastcall function attribute... __attribute__ ((fastcall)) x
checking for function alias... no
checking for __atomic builtins... no
checking for __sync builtins... yes
checking for __builtin_unreachable... yes
checking for exported function attribute... __attribute__ ((visibility("default")))
checking for function name string predefined identifier... __func__
checking whether sys_nerr is declared... yes
checking whether getenv is declared... yes
checking for size_t... yes
checking size of size_t... 4
checking size of ptrdiff_t... 4
checking for printf prefix for size_t... z
checking for printf prefix for ptrdiff_t... t
checking for struct stat.st_blksize... yes
checking for struct stat.st_blocks... yes
checking for struct stat.st_rdev... yes
checking size of struct stat.st_size... SIZEOF_LONG_LONG
checking size of struct stat.st_blocks... SIZEOF_LONG_LONG
checking for struct stat.st_atim... no
checking for struct stat.st_atimespec... yes
checking for struct stat.st_atimensec... no
checking for struct stat.st_mtim... no
checking for struct stat.st_mtimespec... yes
checking for struct stat.st_mtimensec... no
checking for struct stat.st_ctim... no
checking for struct stat.st_ctimespec... yes
checking for struct stat.st_ctimensec... no
checking for struct timeval... yes
checking size of struct timeval.tv_sec... SIZEOF_TIME_T
checking for struct timespec... yes
checking for struct timezone... yes
checking for clockid_t... (cached) no
checking for fd_mask... yes
checking for int8_t... yes
checking size of int8_t... 1
checking for uint8_t... yes
checking size of uint8_t... 1
checking for int16_t... yes
checking size of int16_t... 2
checking for uint16_t... yes
checking size of uint16_t... 2
checking for int32_t... yes
checking size of int32_t... 4
checking for uint32_t... yes
checking size of uint32_t... 4
checking for int64_t... yes
checking size of int64_t... 8
checking for uint64_t... yes
checking size of uint64_t... 8
checking for int128_t... no
checking for uint128_t... no
checking for intptr_t... yes
checking size of intptr_t... 4
checking for uintptr_t... yes
checking size of uintptr_t... 4
checking for ssize_t... yes
checking size of ssize_t... 4
checking for stack end address... no
checking for uid_t in sys/types.h... (cached) yes
checking type of array argument to getgroups... (cached) gid_t
checking return type of signal handlers... void
checking for working memcmp... yes
checking for broken erfc of glibc-2.3.6 on IA64... no
checking for dup2... yes
checking for memmove... yes
checking for strerror... yes
checking for strchr... yes
checking for strstr... yes
checking for crypt... yes
checking for flock... yes
checking for isnan... yes
checking for finite... yes
checking for isinf... yes
checking for hypot... yes
checking for acosh... yes
checking for erf... yes
checking for tgamma... yes
checking for lgamma_r... yes
checking for cbrt... yes
checking for strlcpy... yes
checking for strlcat... yes
checking for ffs... yes
checking for setproctitle... no
checking sys/pstat.h usability... no
checking sys/pstat.h presence... no
checking for sys/pstat.h... no
checking for signbit... yes
checking for __syscall... no
checking for _longjmp... yes
checking for _setjmp... yes
checking for _setjmpex... no
checking for chroot... yes
checking for chsize... no
checking for clock_gettime... no
checking for cosh... yes
checking for daemon... (cached) no
checking for dl_iterate_phdr... no
checking for dlopen... yes
checking for dup... yes
checking for dup3... no
checking for eaccess... no
checking for endgrent... yes
checking for fchmod... yes
checking for fchown... yes
checking for fcntl... yes
checking for fdatasync... (cached) no
checking for fmod... yes
checking for fork... yes
checking for fsync... yes
checking for ftruncate... yes
checking for ftruncate64... no
checking for getcwd... yes
checking for getgrnam_r... yes
checking for getgroups... yes
checking for getpgid... yes
checking for getpgrp... yes
checking for getpriority... yes
checking for getpwnam_r... yes
checking for getrlimit... yes
checking for getsid... yes
checking for gettimeofday... yes
checking for gmtime_r... yes
checking for initgroups... yes
checking for ioctl... yes
checking for issetugid... yes
checking for killpg... yes
checking for lchmod... no
checking for lchown... yes
checking for link... yes
checking for llabs... yes
checking for lockf... yes
checking for log2... yes
checking for lstat... yes
checking for malloc_usable_size... no
checking for malloc_size... yes
checking for mblen... yes
checking for memalign... no
checking for memrchr... no
checking for mktime... yes
checking for pipe2... no
checking for poll... yes
checking for posix_fadvise... no
checking for posix_memalign... no
checking for ppoll... no
checking for pread... yes
checking for readlink... yes
checking for round... yes
checking for seekdir... yes
checking for select_large_fdset... no
checking for sendfile... no
checking for setegid... yes
checking for setenv... yes
checking for seteuid... yes
checking for setgid... yes
checking for setgroups... yes
checking for setpgid... yes
checking for setpgrp... yes
checking for setregid... yes
checking for setresgid... no
checking for setresuid... no
checking for setreuid... yes
checking for setrgid... yes
checking for setrlimit... yes
checking for setruid... yes
checking for setsid... yes
checking for setuid... yes
checking for shutdown... yes
checking for sigaction... yes
checking for sigaltstack... yes
checking for sigprocmask... yes
checking for sinh... yes
checking for spawnv... no
checking for symlink... yes
checking for syscall... yes
checking for sysconf... yes
checking for tanh... yes
checking for telldir... yes
checking for timegm... yes
checking for times... yes
checking for truncate... yes
checking for truncate64... no
checking for unsetenv... yes
checking for utimensat... no
checking for utimes... yes
checking for wait4... yes
checking for waitpid... yes
checking for __builtin_bswap16... no
checking for __builtin_bswap32... yes
checking for __builtin_bswap64... yes
checking for __builtin_clz... yes
checking for __builtin_clzl... yes
checking for __builtin_clzll... yes
checking for __builtin_choose_expr... yes
checking for __builtin_types_compatible_p... yes
checking for clock_gettime in -lrt... no
checking for clock_getres... no
checking for unsetenv returns a value... yes
checking for sigsetjmp as a macro or function... yes
checking for __builtin_setjmp... no
checking for setjmp type... _setjmp
checking whether struct tm is in sys/time.h or time.h... time.h
checking for struct tm.tm_zone... yes
checking for struct tm.tm_gmtoff... yes
checking for external int daylight... yes
checking for external timezone... long
checking for external altzone... no
checking for timezone... yes
checking whether timezone requires zero arguments... yes
checking for negative time_t for gmtime(3)... yes
checking for localtime(3) overflow correctly... yes
checking whether right shift preserve sign bit... yes
checking read count field in FILE structures... _r
checking read buffer ptr field in FILE structures... _p
checking size of struct stat.st_ino... SIZEOF_LONG
checking whether _SC_CLK_TCK is supported... yes
checking stack growing direction on powerpc... -1
checking for pthread_kill in -lthr... no
checking for pthread_kill in -lpthread... yes
checking for pthread_np.h... no
checking for sched_yield... yes
checking for pthread_attr_setinheritsched... yes
checking for pthread_getattr_np... no
checking for pthread_attr_get_np... no
checking for pthread_attr_getstack... yes
checking for pthread_get_stackaddr_np... yes
checking for pthread_get_stacksize_np... yes
checking for thr_stksegment... no
checking for pthread_stackseg_np... no
checking for pthread_getthrds_np... no
checking for pthread_cond_init... yes
checking for pthread_condattr_setclock... no
checking for pthread_condattr_init... yes
checking for pthread_sigmask... yes
checking for pthread_attr_init... yes
checking for getcontext... no
checking for setcontext... no
checking if fork works with pthread... yes
checking whether ELF binaries are produced... no
checking whether OS depend dynamic link works... yes
checking execinfo.h usability... no
checking execinfo.h presence... no
checking for execinfo.h... no
checking for backtrace... no
checking valgrind/memcheck.h usability... no
checking valgrind/memcheck.h presence... no
checking for valgrind/memcheck.h... no
checking for strip... strip
checking whether -Wl,--no-undefined is accepted as LDFLAGS... no
checking for prefix of external symbols... _
checking pthread.h usability... yes
checking pthread.h presence... yes
checking for pthread.h... yes
checking if make is GNU make... yes
checking for memmem... no
checking for nroff... /usr/bin/nroff
.ext/include/powerpc-darwin8.0/ruby/config.h updated
ruby library version = 2.1.0
configure: creating ./config.status
config.status: creating GNUmakefile
config.status: creating Makefile
config.status: creating ruby-2.1.pc
==> make
        CC = /usr/local/bin/gcc-4.2
        LD = ld
        LDSHARED = /usr/local/bin/gcc-4.2 -dynamiclib
        CFLAGS = -Os -w -pipe -mcpu=750 -faltivec -mmacosx-version-min=10.4 -fno-common 
        XCFLAGS = -D_FORTIFY_SOURCE=2 -fno-strict-overflow -fvisibility=hidden -DRUBY_EXPORT
        CPPFLAGS = -I/usr/local/opt/openssl/include -I/usr/local/opt/readline/include -F/usr/local/Frameworks -I/usr/local/opt/openssl/include -D_XOPEN_SOURCE -D_DARWIN_C_SOURCE -D_DARWIN_UNLIMITED_SELECT -D_REENTRANT   -I. -I.ext/include/powerpc-darwin8.0 -I./include -I.
        DLDFLAGS = -Wl,-undefined,dynamic_lookup -Wl,-multiply_defined,suppress -install_name /usr/local/Cellar/ruby/2.1.0/lib/libruby.2.1.0.dylib -current_version 2.1.0 -compatibility_version 2.1.0  -Wl,-u,_objc_msgSend -framework CoreFoundation  -Wl,-u,_objc_msgSend -framework CoreFoundation  
        SOLIBS = -lpthread -lgmp -ldl -lobjc 
Using built-in specs.
Target: powerpc-apple-darwin8
Configured with: /Builds/apple/gcc_42-5553/build/obj/src/configure --disable-checking -enable-werror --prefix=/usr --mandir=/usr/share/man --enable-languages=c,objc,c++,obj-c++,fortran --program-transform-name=/^[cg][^.-]*$/s/$/-4.2/ --with-gxx-include-dir=/usr/include/c++/4.0.0 --with-slibdir=/usr/lib --build=i686-apple-darwin8 --program-prefix= --host=powerpc-apple-darwin8 --target=powerpc-apple-darwin8
Thread model: posix
gcc version 4.2.1 (Apple Inc. build 5553)
compiling main.c
compiling dmydln.c
compiling miniinit.c
compiling miniprelude.c
copying dummy probes.h
compiling array.c
compiling bignum.c
compiling class.c
compiling compar.c
compiling complex.c
compiling dir.c
compiling dln_find.c
compiling encoding.c
compiling enum.c
compiling enumerator.c
compiling error.c
compiling eval.c
compiling load.c
compiling proc.c
compiling file.c
compiling gc.c
compiling hash.c
compiling inits.c
compiling io.c
compiling marshal.c
compiling math.c
compiling node.c
compiling numeric.c
compiling object.c
compiling pack.c
compiling parse.c
compiling process.c
compiling random.c
compiling range.c
compiling rational.c
compiling re.c
compiling regcomp.c
compiling regenc.c
compiling regerror.c
compiling regexec.c
compiling regparse.c
compiling regsyntax.c
compiling ruby.c
compiling safe.c
compiling signal.c
compiling sprintf.c
compiling st.c
compiling strftime.c
compiling string.c
compiling struct.c
compiling time.c
compiling transcode.c
compiling util.c
compiling variable.c
compiling version.c
compiling compile.c
compiling debug.c
compiling iseq.c
compiling vm.c
compiling vm_dump.c
compiling vm_backtrace.c
compiling vm_trace.c
compiling thread.c
compiling cont.c
compiling ./enc/ascii.c
compiling ./enc/us_ascii.c
compiling ./enc/unicode.c
compiling ./enc/utf_8.c
compiling newline.c
compiling ./missing/setproctitle.c
compiling ./missing/alloca.c
compiling dmyext.c
linking miniruby
/usr/bin/ld: Undefined symbols:
___builtin_unreachable
_pthread_setname_np
collect2: ld returned 1 exit status
make: *** [miniruby] Error 1