Compass installation error in OSX Yosemite (or Sierra)

Question

Good afternoon. I have a Mac with OSX Yosemite. I'm trying to install a compass using the command:

sudo gem install compass

but I get the following error:

Building native extensions. This could take a while ...
ERROR: Error installing compass:
    ERROR: Failed to build gem native extension.

    /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/bin/ruby -r ./siteconf20151001-1122-1jqcu8r.rb extconf.rb
mkmf.rb can't find header files for ruby ​​at /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/include/ruby.h

extconf failed, exit code 1

Gem files will remain installed in /Library/Ruby/Gems/2.0.0/gems/ffi-1.9.10 for inspection.
Results logged to /Library/Ruby/Gems/2.0.0/extensions/universal-darwin-14/2.0.0/ffi-1.9.10/gem_make.out

before trying to install the package, I updated the stone with the command

sudo gem update --system

and the update happened without errors

Answer 1

You probably need to install command line development tools first.

xcode-select --install

Then try again sudo gem install compass