[dan@cc58aa6a3875 ~]$ ls
Gemfile  Gemfile.lock
[dan@cc58aa6a3875 ~]$ cat Gemfile
source "https://rubygems.org"

gem "fpm"
gem "rake"
gem "highline"
gem "hiera-eyaml"
gem "serverspec", "2.3.1"
[dan@cc58aa6a3875 ~]$ bundle install --deployment
Fetching gem metadata from https://rubygems.org/.......
Fetching version metadata from https://rubygems.org/..
Installing rake 10.4.2
Installing cabin 0.7.1
Installing arr-pm 0.0.10
Installing backports 3.6.6
Installing ffi 1.9.10 with native extensions

Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension.

/usr/bin/ruby 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()... no
checking for rb_thread_call_with_gvl()... no
checking for rb_thread_call_without_gvl()... no
checking for ffi_prep_cif_var()... no
creating extconf.h
creating Makefile

make
Configuring libffi
configure: WARNING: if you wanted to set the --build type, don't use --host.
    If a cross compiler is detected then cross compile mode will be used
configure: error: in `/home/dan/vendor/bundle/ruby/1.8/gems/ffi-1.9.10/ext/ffi_c/libffi-x86_64-linux':
configure: error: no acceptable C compiler found in $PATH
See `config.log' for more details
make: *** ["/home/dan/vendor/bundle/ruby/1.8/gems/ffi-1.9.10/ext/ffi_c/libffi-x86_64-linux"/.libs/libffi_convenience.a] Error 1


Gem files will remain installed in /home/dan/vendor/bundle/ruby/1.8/gems/ffi-1.9.10 for inspection.
Results logged to /home/dan/vendor/bundle/ruby/1.8/gems/ffi-1.9.10/ext/ffi_c/gem_make.out
An error occurred while installing ffi (1.9.10), and Bundler cannot continue.
Make sure that `gem install ffi -v '1.9.10'` succeeds before bundling.
[dan@cc58aa6a3875 ~]$