* Package:    dev-ruby/ffi-1.9.17
 * Repository: gentoo
 * Maintainer: ruby@gentoo.org
 * USE:        abi_x86_64 amd64 elibc_glibc kernel_linux ruby_targets_ruby23 userland_GNU
 * FEATURES:   compressdebug distcc-pump preserve-libs sandbox splitdebug userpriv usersandbox
>>> cfg-update-1.8.2-r1: Checksum index is up-to-date ...
>>> Unpacking source...
 * Running unpack phase for all ...
>>> Unpacking ffi-git-1.9.17.tgz to /var/tmp/portage/dev-ruby/ffi-1.9.17/work/all
>>> Source unpacked in /var/tmp/portage/dev-ruby/ffi-1.9.17/work
>>> Preparing source in /var/tmp/portage/dev-ruby/ffi-1.9.17/work ...
 * Running prepare phase for all ...
 * Running source copy phase for ruby23 ...
>>> Source prepared.
>>> Configuring source in /var/tmp/portage/dev-ruby/ffi-1.9.17/work ...
 * Running configure phase for ruby23 ...
checking for ffi.h... no
checking for ffi.h in /usr/local/include,/usr/include/ffi... no
checking for rb_thread_blocking_region()... no
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
>>> Source configured.
>>> Compiling source in /var/tmp/portage/dev-ruby/ffi-1.9.17/work ...
 * Running compile phase for ruby23 ...
make -j24 -l7 -Cext/ffi_c V=1 
make: Entering directory '/var/tmp/portage/dev-ruby/ffi-1.9.17/work/ruby23/ffi-1.9.17/ext/ffi_c'
Configuring libffi
/bin/sh: 0: Can't open /var/tmp/portage/dev-ruby/ffi-1.9.17/work/ruby23/ffi-1.9.17/ext/ffi_c/libffi/configure
make: *** [libffi.mk:7: "/var/tmp/portage/dev-ruby/ffi-1.9.17/work/ruby23/ffi-1.9.17/ext/ffi_c/libffi-x86_64-linux"/.libs/libffi_convenience.a] Error 127
make: Leaving directory '/var/tmp/portage/dev-ruby/ffi-1.9.17/work/ruby23/ffi-1.9.17/ext/ffi_c'
 * ERROR: dev-ruby/ffi-1.9.17::gentoo failed (compile phase):
 *   emake failed
 * 
 * If you need support, post the output of `emerge --info '=dev-ruby/ffi-1.9.17::gentoo'`,
 * the complete build log and the output of `emerge -pqv '=dev-ruby/ffi-1.9.17::gentoo'`.
 * The complete build log is located at '/var/log/portage/dev-ruby:ffi-1.9.17:20170128-232004.log.gz'.
 * The ebuild environment file is located at '/var/tmp/portage/dev-ruby/ffi-1.9.17/temp/environment'.
 * Working directory: '/var/tmp/portage/dev-ruby/ffi-1.9.17/work/ruby23/ffi-1.9.17'
 * S: '/var/tmp/portage/dev-ruby/ffi-1.9.17/work/ruby23/ffi-1.9.17'
!!! When you file a bug report, please include the following information:
GENTOO_VM=  CLASSPATH="" JAVA_HOME="/etc/java-config-2/current-system-vm"
JAVACFLAGS="" COMPILER=""
and of course, the output of emerge --info =ffi-1.9.17