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```
ERROR: Error installing compass:
ERROR: Failed to build gem native extension.
current directory: /var/lib/gems/2.1.0/gems/ffi-1.9.10/ext/ffi_c
/usr/bin/ruby2.1 -r ./siteconf20151118-18985-1l1bsx7.rb extconf.rb
mkmf.rb can't find header files for ruby at /usr/lib/ruby/include/ruby.h
extconf failed, exit code 1