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Impossibile creare l'estensione nativa gemma (installazione di Compass)
Quando provo ad installare l'ultima versione di compass ( https://rubygems.org/gems/compass/versions/1.0.0.alpha.17 ), ottengo il seguente errore. ERROR: Error installing compass: ERROR: Failed to build gem native extension. ERROR: Error installing compass: ERROR: Failed to build gem native extension. /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/bin/ruby extconf.rb checking for ffi.h... no checking for ffi.h in /usr/local/include,/usr/include/ffi... yes checking …