current directory: /Users/ino/dev/oss/vagrant-compose-yaml/vendor/bundle/ruby/2.2.0/gems/unf_ext-0.0.7.2/ext/unf_ext
/Users/ino/.rbenv/versions/2.2.3/bin/ruby -r ./siteconf20160912-49116-1riy0r2.rb extconf.rb
checking for main() in -lstdc++... yes
creating Makefile

To see why this extension failed to compile, please check the mkmf.log which can be found here:

  /Users/ino/dev/oss/vagrant-compose-yaml/vendor/bundle/ruby/2.2.0/extensions/x86_64-darwin-14/2.2.0-static/unf_ext-0.0.7.2/mkmf.log

current directory: /Users/ino/dev/oss/vagrant-compose-yaml/vendor/bundle/ruby/2.2.0/gems/unf_ext-0.0.7.2/ext/unf_ext
make "DESTDIR=" clean

current directory: /Users/ino/dev/oss/vagrant-compose-yaml/vendor/bundle/ruby/2.2.0/gems/unf_ext-0.0.7.2/ext/unf_ext
make "DESTDIR="
compiling unf.cc
linking shared-object unf_ext.bundle

current directory: /Users/ino/dev/oss/vagrant-compose-yaml/vendor/bundle/ruby/2.2.0/gems/unf_ext-0.0.7.2/ext/unf_ext
make "DESTDIR=" install
/usr/bin/install -c -m 0755 unf_ext.bundle ./.gem.20160912-49116-1x9ggze