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无法构建gem本机扩展(安装Compass)
当我尝试安装最新版本的指南针(https://rubygems.org/gems/compass/versions/1.0.0.alpha.17)时,出现以下错误。 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 for ffi_call() in -lffi... yes checking for ffi_prep_closure()... yes checking for ffi_raw_call()... no checking …