Can't install ffi 1.9.0 via rvm bundle install via cygwin

acer@acer-PC /cygdrive/e/wamp/www/caare_new/sites/all/themes/omega_caare
$ bundle install
Fetching gem metadata from https://rubygems.org/..........
Fetching additional metadata from https://rubygems.org/..
Resolving dependencies...
Installing addressable 2.3.6
Installing chunky_png 1.3.1
Installing fssm 0.2.10
Installing sass 3.2.19
Installing compass 0.12.6
Installing breakpoint 2.0.7
Installing timers 1.1.0
Installing celluloid 0.15.2
Installing nio4r 1.0.0
Installing celluloid-io 0.15.0
Installing coderay 1.1.0
Installing compass-blend-modes 0.0.2
Installing color-schemer 0.2.8
Installing compass-normalize 1.5
Installing compass-rgbapng 0.2.1
Installing compass-validator 3.0.1
Installing css_parser 1.3.5
Installing eventmachine 1.0.3
Installing http_parser.rb 0.6.0
Installing em-websocket 0.5.1

Gem::Ext::BuildError: ERROR: Failed to build gem native extension.

    /home/acer/.rvm/rubies/ruby-1.9.3-p545/bin/ruby.exe extconf.rb
checking for ffi.h... no
checking for ffi.h in /usr/local/include,/usr/include/ffi... no
checking for rb_thread_blocking_region()... yes
checking for rb_thread_call_with_gvl()... yes
checking for rb_thread_call_without_gvl()... yes
checking for ffi_prep_cif_var()... no
creating extconf.h
creating Makefile

make  clean

make
Configuring libffi
make -C "/home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi-x86_64-cygwin"
make[1]: Entering directory '/home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi-x86_64-cygwin'
make "AR_FLAGS=" "CC_FOR_BUILD=" "CFLAGS=-Wall -fexceptions" "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/sh /home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi/missing --run makeinfo " "PICFLAG=" "PICFLAG_FOR_TARGET=" "RUNTESTFLAGS=" "SHELL=/bin/sh" "exec_prefix=/usr/local" "infodir=/usr/local/share/info" "libdir=/usr/local/lib" "mandir=/usr/local/share/man" "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 '/home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi-x86_64-cygwin'
Making all in include
make[3]: Entering directory '/home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi-x86_64-cygwin/include'
make[3]: Nothing to be done for 'all'.
make[3]: Leaving directory '/home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi-x86_64-cygwin/include'
Making all in testsuite
make[3]: Entering directory '/home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi-x86_64-cygwin/testsuite'
make[3]: Nothing to be done for 'all'.
make[3]: Leaving directory '/home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi-x86_64-cygwin/testsuite'
Making all in man
make[3]: Entering directory '/home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi-x86_64-cygwin/man'
make[3]: Nothing to be done for 'all'.
make[3]: Leaving directory '/home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi-x86_64-cygwin/man'
make[3]: Entering directory '/home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi-x86_64-cygwin'
restore=: && backupdir=".am$$" && \
am__cwd=`pwd` && CDPATH="${ZSH_VERSION+.}:" && cd /home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi && \
rm -rf $backupdir && mkdir $backupdir && \
if (/bin/sh /home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi/missing --run makeinfo   --version) >/dev/null 2>&1; then \
  for f in /home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi/doc/libffi.info /home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi/doc/libffi.info-[0-9] /home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi/doc/libffi.info-[0-9][0-9] /home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi/doc/libffi.i[0-9] /home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi/doc/libffi.i[0-9][0-9]; do \
    if test -f $f; then mv $f $backupdir; restore=mv; else :; fi; \
  done; \
else :; fi && \
cd "$am__cwd"; \
if /bin/sh /home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi/missing --run makeinfo     -I doc -I /home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi/doc \
 -o /home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi/doc/libffi.info /home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi/doc/libffi.texi; \
then \
  rc=0; \
  CDPATH="${ZSH_VERSION+.}:" && cd /home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi; \
else \
  rc=$?; \
  CDPATH="${ZSH_VERSION+.}:" && cd /home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi && \
  $restore $backupdir/* `echo ".//home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi/doc/libffi.info" | sed 's|[^/]*$||'`; \
fi; \
rm -rf $backupdir; exit $rc
/home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi/doc/libffi.texi:341: warning: missing name for @deftp
/bin/sh ./libtool --tag=CC   --mode=compile gcc -DHAVE_CONFIG_H -I. -I/home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi  -I. -I/home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi/include -Iinclude -I/home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi/src  -g  -Wall -fexceptions -c -o src/debug.lo /home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi/src/debug.c
libtool: compile:  gcc -DHAVE_CONFIG_H -I. -I/home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi -I. -I/home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi/include -Iinclude -I/home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi/src -g -Wall -fexceptions -c /home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi/src/debug.c  -DDLL_EXPORT -DPIC -o src/.libs/debug.o
/bin/sh ./libtool --tag=CC   --mode=compile gcc -DHAVE_CONFIG_H -I. -I/home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi  -I. -I/home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi/include -Iinclude -I/home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi/src  -g  -Wall -fexceptions -c -o src/prep_cif.lo /home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi/src/prep_cif.c
libtool: compile:  gcc -DHAVE_CONFIG_H -I. -I/home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi -I. -I/home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi/include -Iinclude -I/home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi/src -g -Wall -fexceptions -c /home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi/src/prep_cif.c  -DDLL_EXPORT -DPIC -o src/.libs/prep_cif.o
/bin/sh ./libtool --tag=CC   --mode=compile gcc -DHAVE_CONFIG_H -I. -I/home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi  -I. -I/home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi/include -Iinclude -I/home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi/src  -g  -Wall -fexceptions -c -o src/types.lo /home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi/src/types.c
libtool: compile:  gcc -DHAVE_CONFIG_H -I. -I/home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi -I. -I/home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi/include -Iinclude -I/home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi/src -g -Wall -fexceptions -c /home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi/src/types.c  -DDLL_EXPORT -DPIC -o src/.libs/types.o
/bin/sh ./libtool --tag=CC   --mode=compile gcc -DHAVE_CONFIG_H -I. -I/home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi  -I. -I/home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi/include -Iinclude -I/home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi/src  -g  -Wall -fexceptions -c -o src/raw_api.lo /home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi/src/raw_api.c
libtool: compile:  gcc -DHAVE_CONFIG_H -I. -I/home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi -I. -I/home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi/include -Iinclude -I/home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi/src -g -Wall -fexceptions -c /home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi/src/raw_api.c  -DDLL_EXPORT -DPIC -o src/.libs/raw_api.o
/bin/sh ./libtool --tag=CC   --mode=compile gcc -DHAVE_CONFIG_H -I. -I/home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi  -I. -I/home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi/include -Iinclude -I/home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi/src  -g  -Wall -fexceptions -c -o src/java_raw_api.lo /home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi/src/java_raw_api.c
libtool: compile:  gcc -DHAVE_CONFIG_H -I. -I/home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi -I. -I/home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi/include -Iinclude -I/home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi/src -g -Wall -fexceptions -c /home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi/src/java_raw_api.c  -DDLL_EXPORT -DPIC -o src/.libs/java_raw_api.o
/bin/sh ./libtool --tag=CC   --mode=compile gcc -DHAVE_CONFIG_H -I. -I/home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi  -I. -I/home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi/include -Iinclude -I/home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi/src  -g  -Wall -fexceptions -c -o src/closures.lo /home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi/src/closures.c
libtool: compile:  gcc -DHAVE_CONFIG_H -I. -I/home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi -I. -I/home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi/include -Iinclude -I/home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi/src -g -Wall -fexceptions -c /home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi/src/closures.c  -DDLL_EXPORT -DPIC -o src/.libs/closures.o
/bin/sh ./libtool --tag=CC   --mode=compile gcc -DHAVE_CONFIG_H -I. -I/home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi  -I. -I/home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi/include -Iinclude -I/home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi/src  -g  -Wall -fexceptions -c -o src/x86/ffi.lo /home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi/src/x86/ffi.c
libtool: compile:  gcc -DHAVE_CONFIG_H -I. -I/home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi -I. -I/home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi/include -Iinclude -I/home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi/src -g -Wall -fexceptions -c /home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi/src/x86/ffi.c  -DDLL_EXPORT -DPIC -o src/x86/.libs/ffi.o
/bin/sh ./libtool   --mode=compile gcc -DHAVE_CONFIG_H -I. -I/home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi  -I. -I/home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi/include -Iinclude -I/home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi/src  -I. -I/home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi/include -Iinclude -I/home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi/src  -c -o src/x86/win64.lo /home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi/src/x86/win64.S
libtool: compile:  gcc -DHAVE_CONFIG_H -I. -I/home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi -I. -I/home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi/include -Iinclude -I/home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi/src -I. -I/home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi/include -Iinclude -I/home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi/src -c /home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi/src/x86/win64.S  -DDLL_EXPORT -DPIC -o src/x86/.libs/win64.o
/bin/sh ./libtool --tag=CC   --mode=link gcc -g  -Wall -fexceptions -version-info `grep -v '^#' /home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi/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/win64.lo
libtool: link: warning: undefined symbols not allowed in x86_64-unknown-cygwin shared libraries
libtool: link: ar cru .libs/libffi.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/win64.o
libtool: link: ranlib .libs/libffi.a
libtool: link: ( cd ".libs" && rm -f "libffi.la" && ln -s "../libffi.la" "libffi.la" )
/bin/sh ./libtool --tag=CC   --mode=link gcc -g  -Wall -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/win64.lo
libtool: link: rm -fr  .libs/libffi_convenience.a(D)
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/win64.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 '/home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi-x86_64-cygwin'
make[2]: Leaving directory '/home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi-x86_64-cygwin'
make[1]: Leaving directory '/home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi-x86_64-cygwin'
compiling AbstractMemory.c
compiling ArrayType.c
compiling Buffer.c
compiling Call.c
compiling ClosurePool.c
compiling DataConverter.c
compiling DynamicLibrary.c
compiling ffi.c
compiling Function.c
Function.c: In function ‘callback_invoke’:
Function.c:479:9: warning: passing argument 1 of ‘rb_thread_call_with_gvl’ from incompatible pointer type [enabled by default]
         rb_thread_call_with_gvl(callback_with_gvl, &cb);
         ^
Function.c:102:14: note: expected ‘void * (*)(void *)’ but argument is of type ‘VALUE (*)(void *)’
 extern void *rb_thread_call_with_gvl(void *(*func)(void *), void *data1);
              ^
compiling FunctionInfo.c
compiling LastError.c
compiling LongDouble.c
compiling MappedType.c
compiling MemoryPointer.c
compiling MethodHandle.c
compiling Platform.c
compiling Pointer.c
compiling Struct.c
compiling StructByReference.c
compiling StructByValue.c
compiling StructLayout.c
compiling Thread.c
compiling Type.c
compiling Types.c
compiling Variadic.c
linking shared-object ffi_c.so
Call.o: In function `call_blocking_function':
/home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/Call.c:294: undefined reference to `ffi_call'
/home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/Call.c:294:(.text+0x94): relocation truncated to fit: R_X86_64_PC32 against undefined symbol `ffi_call'
Call.o: In function `rbffi_CallFunction':
/home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/Call.c:378: undefined reference to `ffi_call'
/home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/Call.c:378:(.text+0xa99): relocation truncated to fit: R_X86_64_PC32 against undefined symbol `ffi_call'
Variadic.o: In function `variadic_invoke':
/home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/Variadic.c:252: undefined reference to `ffi_call'
/home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/Variadic.c:252:(.text+0x36d): relocation truncated to fit: R_X86_64_PC32 against undefined symbol `ffi_call'
/home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi-x86_64-cygwin/.libs/libffi_convenience.a(prep_cif.o): In function `ffi_prep_cif':
/home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi/src/prep_cif.c:162: undefined reference to `ffi_prep_cif_machdep'
/home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi/src/prep_cif.c:162:(.text+0x272): relocation truncated to fit: R_X86_64_PC32 against undefined symbol `ffi_prep_cif_machdep'
/home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi-x86_64-cygwin/.libs/libffi_convenience.a(prep_cif.o): In function `ffi_prep_closure':
/home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi/src/prep_cif.c:174: undefined reference to `ffi_prep_closure_loc'
/home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3/ext/ffi_c/libffi/src/prep_cif.c:174:(.text+0x2b7): relocation truncated to fit: R_X86_64_PC32 against undefined symbol `ffi_prep_closure_loc'
collect2: error: ld returned 1 exit status
Makefile:214: recipe for target 'ffi_c.so' failed
make: *** [ffi_c.so] Error 1

make failed, exit code 2

Gem files will remain installed in /home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/gems/ffi-1.9.3 for inspection.
Results logged to /home/acer/.rvm/gems/ruby-1.9.3-p545@omega.omega_caare/extensions/x86_64-cygwin/1.9.1/ffi-1.9.3/gem_make.out
An error occurred while installing ffi (1.9.3), and Bundler cannot continue.
Make sure that `gem install ffi -v '1.9.3'` succeeds before bundling.