This is the output I get when trying to gem install ffi -v '1.0.11'

gistfile1.txt

$  gem install ffi -v '1.0.11'

ERROR:  Error installing ffi:
        ERROR: Failed to build gem native extension.

        /usr/local/rvm/rubies/ruby-head/bin/ruby extconf.rb
checking for ffi.h... no
checking for ffi.h in /usr/local/include... no
checking for rb_thread_blocking_region()... yes
checking for ruby_native_thread_p()... yes
checking for rb_thread_call_with_gvl()... yes
creating extconf.h
creating Makefile

make
Configuring libffi
make -C "/usr/local/rvm/gems/ruby-head/gems/ffi-1.0.11/ext/ffi_c/libffi"
make[1]: Entering directory `/usr/local/rvm/gems/ruby-head/gems/ffi-1.0.11/ext/ffi_c/libffi'
make "AR_FLAGS=" "CC_FOR_BUILD=" "CFLAGS=" "CXXFLAGS=" "CFLAGS_FOR_BUILD=" "CFLAGS_FOR_TARGET=" "INSTALL=/usr/bin/install -c" "INSTALL_DATA=/usr/bin/install -c -m 644" "INSTALL_PROGRAM=/usr/bin/install -c" "INSTALL_SCRIPT=/usr/bin/install -c" "JC1FLAGS=" "LDFLAGS=" "LIBCFLAGS=" "LIBCFLAGS_FOR_TARGET=" "MAKE=make" "MAKEINFO=/bin/bash /usr/local/rvm/gems/ruby-head/gems/ffi-1.0.11/ext/ffi_c/libffi/missing --run makeinfo " "PICFLAG=" "PICFLAG_FOR_TARGET=" "RUNTESTFLAGS=" "SHELL=/bin/bash" "exec_prefix=/usr/local" "infodir=/usr/local/share/info" "libdir=/usr/local/lib" "prefix=/usr/local" "AR=ar" "AS=as" "CC=gcc" "CXX=g++" "LD=/usr/bin/ld" "NM=/usr/bin/nm -B" "RANLIB=ranlib" "DESTDIR=" all-recursive
make[2]: Entering directory `/usr/local/rvm/gems/ruby-head/gems/ffi-1.0.11/ext/ffi_c/libffi'
Making all in include
make[3]: Entering directory `/usr/local/rvm/gems/ruby-head/gems/ffi-1.0.11/ext/ffi_c/libffi/include'
make[3]: Nothing to be done for `all'.
make[3]: Leaving directory `/usr/local/rvm/gems/ruby-head/gems/ffi-1.0.11/ext/ffi_c/libffi/include'
Making all in testsuite
make[3]: Entering directory `/usr/local/rvm/gems/ruby-head/gems/ffi-1.0.11/ext/ffi_c/libffi/testsuite'
make[3]: Nothing to be done for `all'.
make[3]: Leaving directory `/usr/local/rvm/gems/ruby-head/gems/ffi-1.0.11/ext/ffi_c/libffi/testsuite'
Making all in man
make[3]: Entering directory `/usr/local/rvm/gems/ruby-head/gems/ffi-1.0.11/ext/ffi_c/libffi/man'
make[3]: Nothing to be done for `all'.
make[3]: Leaving directory `/usr/local/rvm/gems/ruby-head/gems/ffi-1.0.11/ext/ffi_c/libffi/man'
make[3]: Entering directory `/usr/local/rvm/gems/ruby-head/gems/ffi-1.0.11/ext/ffi_c/libffi'
/bin/bash ./libtool --tag=CC   --mode=compile gcc -DHAVE_CONFIG_H -I.  -I. -I./include -Iinclude -I./src  -Wall -g -fexceptions  -c -o src/debug.lo src/debug.c
libtool: compile:  gcc -DHAVE_CONFIG_H -I. -I. -I./include -Iinclude -I./src -Wall -g -fexceptions -c src/debug.c  -fPIC -DPIC -o src/.libs/debug.o
/bin/bash ./libtool --tag=CC   --mode=compile gcc -DHAVE_CONFIG_H -I.  -I. -I./include -Iinclude -I./src  -Wall -g -fexceptions  -c -o src/prep_cif.lo src/prep_cif.c
libtool: compile:  gcc -DHAVE_CONFIG_H -I. -I. -I./include -Iinclude -I./src -Wall -g -fexceptions -c src/prep_cif.c  -fPIC -DPIC -o src/.libs/prep_cif.o
/bin/bash ./libtool --tag=CC   --mode=compile gcc -DHAVE_CONFIG_H -I.  -I. -I./include -Iinclude -I./src  -Wall -g -fexceptions  -c -o src/types.lo src/types.c
libtool: compile:  gcc -DHAVE_CONFIG_H -I. -I. -I./include -Iinclude -I./src -Wall -g -fexceptions -c src/types.c  -fPIC -DPIC -o src/.libs/types.o
/bin/bash ./libtool --tag=CC   --mode=compile gcc -DHAVE_CONFIG_H -I.  -I. -I./include -Iinclude -I./src  -Wall -g -fexceptions  -c -o src/raw_api.lo src/raw_api.c
libtool: compile:  gcc -DHAVE_CONFIG_H -I. -I. -I./include -Iinclude -I./src -Wall -g -fexceptions -c src/raw_api.c  -fPIC -DPIC -o src/.libs/raw_api.o
/bin/bash ./libtool --tag=CC   --mode=compile gcc -DHAVE_CONFIG_H -I.  -I. -I./include -Iinclude -I./src  -Wall -g -fexceptions  -c -o src/java_raw_api.lo src/java_raw_api.c
libtool: compile:  gcc -DHAVE_CONFIG_H -I. -I. -I./include -Iinclude -I./src -Wall -g -fexceptions -c src/java_raw_api.c  -fPIC -DPIC -o src/.libs/java_raw_api.o
/bin/bash ./libtool --tag=CC   --mode=compile gcc -DHAVE_CONFIG_H -I.  -I. -I./include -Iinclude -I./src  -Wall -g -fexceptions  -c -o src/closures.lo src/closures.c
libtool: compile:  gcc -DHAVE_CONFIG_H -I. -I. -I./include -Iinclude -I./src -Wall -g -fexceptions -c src/closures.c  -fPIC -DPIC -o src/.libs/closures.o
/bin/bash ./libtool --tag=CC   --mode=compile gcc -DHAVE_CONFIG_H -I.  -I. -I./include -Iinclude -I./src  -Wall -g -fexceptions  -c -o src/x86/ffi.lo src/x86/ffi.c
libtool: compile:  gcc -DHAVE_CONFIG_H -I. -I. -I./include -Iinclude -I./src -Wall -g -fexceptions -c src/x86/ffi.c  -fPIC -DPIC -o src/x86/.libs/ffi.o
/bin/bash ./libtool   --mode=compile gcc -DHAVE_CONFIG_H -I.  -I. -I./include -Iinclude -I./src  -I. -I./include -Iinclude -I./src  -c -o src/x86/sysv.lo src/x86/sysv.S
libtool: compile:  gcc -DHAVE_CONFIG_H -I. -I. -I./include -Iinclude -I./src -I. -I./include -Iinclude -I./src -c src/x86/sysv.S  -fPIC -DPIC -o src/x86/.libs/sysv.o
/bin/bash ./libtool --tag=CC   --mode=link gcc -Wall -g -fexceptions  -version-info `grep -v '^#' ./libtool-version`   -o libffi.la -rpath /usr/local/lib src/debug.lo src/prep_cif.lo src/types.lo src/raw_api.lo src/java_raw_api.lo src/closures.lo  src/x86/ffi.lo src/x86/sysv.lo
libtool: link: gcc -shared  src/.libs/debug.o src/.libs/prep_cif.o src/.libs/types.o src/.libs/raw_api.o src/.libs/java_raw_api.o src/.libs/closures.o src/x86/.libs/ffi.o src/x86/.libs/sysv.o      -Wl,-soname -Wl,libffi.so.5 -o .libs/libffi.so.5.0.10
libtool: link: (cd ".libs" && rm -f "libffi.so.5" && ln -s "libffi.so.5.0.10" "libffi.so.5")
libtool: link: (cd ".libs" && rm -f "libffi.so" && ln -s "libffi.so.5.0.10" "libffi.so")
libtool: link: ( cd ".libs" && rm -f "libffi.la" && ln -s "../libffi.la" "libffi.la" )
/bin/bash ./libtool --tag=CC   --mode=link gcc -Wall -g -fexceptions    -o libffi_convenience.la  src/debug.lo src/prep_cif.lo src/types.lo src/raw_api.lo src/java_raw_api.lo src/closures.lo  src/x86/ffi.lo src/x86/sysv.lo                  
libtool: link: ar cru .libs/libffi_convenience.a src/.libs/debug.o src/.libs/prep_cif.o src/.libs/types.o src/.libs/raw_api.o src/.libs/java_raw_api.o src/.libs/closures.o src/x86/.libs/ffi.o src/x86/.libs/sysv.o
libtool: link: ranlib .libs/libffi_convenience.a
libtool: link: ( cd ".libs" && rm -f "libffi_convenience.la" && ln -s "../libffi_convenience.la" "libffi_convenience.la" )
make[3]: Leaving directory `/usr/local/rvm/gems/ruby-head/gems/ffi-1.0.11/ext/ffi_c/libffi'
make[2]: Leaving directory `/usr/local/rvm/gems/ruby-head/gems/ffi-1.0.11/ext/ffi_c/libffi'
make[1]: Leaving directory `/usr/local/rvm/gems/ruby-head/gems/ffi-1.0.11/ext/ffi_c/libffi'
compiling StructByReference.c
In file included from /usr/include/bits/string2.h:52,
                 from /usr/include/string.h:635,
                 from /usr/local/rvm/rubies/ruby-head/include/ruby-2.0.0/ruby/ruby.h:51,
                 from /usr/local/rvm/rubies/ruby-head/include/ruby-2.0.0/ruby.h:33,
                 from StructByReference.c:34:
./endian.h:43:4: error: #error "Cannot determine the endian-ness of this platform"
In file included from Pointer.h:30,
                 from StructByReference.c:40:
AbstractMemory.h:68: error: expected specifier-qualifier-list before â/â token
AbstractMemory.h: In function âcheckBoundsâ:
AbstractMemory.h:87: error: âAbstractMemoryâ has no member named âsizeâ
AbstractMemory.h: In function âcheckReadâ:
AbstractMemory.h:96: error: âAbstractMemoryâ has no member named âflagsâ
AbstractMemory.h: In function âcheckWriteâ:
AbstractMemory.h:104: error: âAbstractMemoryâ has no member named âflagsâ
make: *** [StructByReference.o] Error 1


Gem files will remain installed in /usr/local/rvm/gems/ruby-head/gems/ffi-1.0.11 for inspection.
Results logged to /usr/local/rvm/gems/ruby-head/gems/ffi-1.0.11/ext/ffi_c/gem_make.out