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Cannot install gems with native extension on Lion even with Developer Tools installed

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Jason Brennan

02 Oct, 2011 04:24 PM

I've got a clean install of Lion and I'm trying to install some gems which need native extensions.

sudo gem install rmagick

Fails:

Building native extensions. This could take a while...
ERROR: Error installing rmagick:

ERROR: Failed to build gem native extension.

    /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/ruby extconf.rb

mkmf.rb can't find header files for ruby at /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/ruby.h

It looks as though the ruby.h file has moved but I don't know how to fix this problem.

I'm running the latest version of rubygems.

1. Support Staff 2 Posted by Nick Quaranto on 12 Oct, 2011 02:26 PM

   

   Yikes, not sure about this one :(

   Can you try to install a newer Ruby with RVM instead?

   https://rvm.beginrescueend.com/rvm/install/

   Then

   rvm install 1.9.2 rvm use 1.9.2 gem install rmagick

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