ruby-2.2.4 on OS X Yosemite

/var/folders/g2/fzfdvxhx5bvdq5y99syc4_fh0000gn/T/ruby-build.20151217020923.4369 ~/.rbenv/plugins/ruby-build
/var/folders/g2/fzfdvxhx5bvdq5y99syc4_fh0000gn/T/ruby-build.20151217020923.4369/ruby-2.2.4 /var/folders/g2/fzfdvxhx5bvdq5y99syc4_fh0000gn/T/ruby-build.20151217020923.4369 ~/.rbenv/plugins/ruby-build
config.guess already exists
config.sub already exists
checking build system type... x86_64-apple-darwin14.5.0
checking host system type... x86_64-apple-darwin14.5.0
checking target system type... x86_64-apple-darwin14.5.0
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 clang accepts -g... yes
checking for clang option to accept ISO C89... none needed
checking whether we are using the GNU C++ compiler... yes
checking whether clang++ accepts -g... yes
checking how to run the C preprocessor... clang -E
checking for grep that handles long lines and -e... /usr/bin/grep
checking for egrep... /usr/bin/grep -E
checking whether clang needs -traditional... no
checking for ld... ld
checking whether the linker is GNU ld... no
checking whether clang -E accepts -o... yes
checking for real target cpu... x86_64
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... dtrace
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... make: *** No targets specified and no makefile found.  Stop.