title: Mac Rmagick won't install with Xcode 4.2
body: <p>I just got a new macbook pro and trying to setup my dev environment.
  I downloaded xcode 4.2 from the app store and installed it, after this i installed homebrew and RVM.
  ImageMagick, readline, ruby 1.9.3-head all installed perfectly until i ran bundle update which tried to install rmagick.</p>
  
  <p>After a long long time investigating i come down to the conclusion that it can't find libgomp.</p>
  
  <p>The output is from <code>gem install rmagick</code> is:</p>
  
  <pre><code>$ gem install rmagick
  Building native extensions.  This could take a while...
  ERROR:  Error installing rmagick:
          ERROR: Failed to build gem native extension.
  
          /Users/dhiemstra/.rvm/rubies/ruby-1.9.3-head/bin/ruby extconf.rb
  checking for Ruby version &gt;= 1.8.5... yes
  extconf.rb:128: Use RbConfig instead of obsolete and deprecated Config.
  checking for clang... yes
  checking for Magick-config... yes
  checking for ImageMagick version &gt;= 6.4.9... yes
  checking for HDRI disabled version of ImageMagick... yes
  checking for stdint.h... *** extconf.rb failed ***
  Could not create Makefile due to some reason, probably lack of
  necessary libraries and/or headers.  Check the mkmf.log file for more
  details.  You may need configuration options.
  
  Provided configuration options:
          --with-opt-dir
          --without-opt-dir
          --with-opt-include
          --without-opt-include=${opt-dir}/include
          --with-opt-lib
          --without-opt-lib=${opt-dir}/lib
          --with-make-prog
          --without-make-prog
          --srcdir=.
          --curdir
          --ruby=/Users/dhiemstra/.rvm/rubies/ruby-1.9.3-head/bin/ruby
  /Users/dhiemstra/.rvm/rubies/ruby-1.9.3-head/lib/ruby/1.9.1/mkmf.rb:381:in `try_do': The compiler failed to generate an executable file. (RuntimeError)
  You have to install development tools first.
  </code></pre>
  
  <p>Here is my mkmf.log file:</p>
  
  <pre><code>"clang -o conftest -I/Users/dhiemstra/.rvm/rubies/ruby-1.9.3-head/include/ruby-1.9.1/x86_64-darwin11.2.0 -I/Users/dhiemstra/.rvm/rubies/ruby-1.9.3-head/include/ruby-1.9.1/ruby/backward -I/Users/dhiemstra/.rvm/rubies/ruby-1.9.3-head/include/ruby-1.9.1 -I.  -I/usr/local/Cellar/imagemagick/6.7.1-1/include/ImageMagick  -I/usr/local/Cellar/imagemagick/6.7.1-1/include/ImageMagick -fopenmp conftest.c  -L. -L/Users/dhiemstra/.rvm/rubies/ruby-1.9.3-head/lib  -L/usr/local/Cellar/imagemagick/6.7.1-1/lib -L/usr/X11/lib    -L/usr/local/Cellar/imagemagick/6.7.1-1/lib -lMagickCore -llcms -ltiff -lfreetype -ljpeg -L/usr/X11/lib -lfontconfig -lXext -lSM -lICE -lX11 -lXt -lbz2 -lz -lm -lgomp -lpthread -lltdl  -lruby.1.9.1  -lpthread -ldl -lobjc "
  ld: library not found for -lgomp
  clang: error: linker command failed with exit code 1 (use -v to see invocation)
  checked program was:
  /* begin */
  1: #include "ruby.h"
  2: 
  3: int main() {return 0;}
  /* end */
  </code></pre>
  
  <p>Now i assumed here that something was wrong with xcode i tried several things:</p>
  
  <ul>
  <li>Reinstall xcode</li>
  <li>Remove imagemagick and reinstalled it including other libraries like jpg, libpng etc</li>
  <li>Installed older version of imagemagick</li>
  <li>Removed .rvm and reinstalled a fresh copy of ruby</li>
  </ul>
  
  <p>I have no clue what's left for me to try, could anyone help to push me in the good direction?</p>