红宝石 – Mac Rmagick不会安装Xcode 4.2

我刚刚获得了一个新的macbook pro，并试图设置我的开发环境。
我从应用商店下载了xcode 4.2并安装了它，之后我安装了自制软件和RVM。
ImageMagick，readline，ruby 1.9.3-head全部安装，直到我运行捆绑更新，试图安装rmagick。

经过很长时间的调查，我下定决心找不到libgomp。

输出是从gem安装rmagick是：

$ 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 >= 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 >= 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.

这是我的mkmf.log文件：

"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 */

现在我在这里假设xcode出了问题，我尝试了几件事情：

>重新安装xcode
>删除imagemagick并重新安装包括其他库，如jpg，libpng等
>安装旧版本的imagemagick
>删除了.rvm并重新安装了一个新的ruby副本

我没有任何线索给我留下什么，有人可以帮助我推动我的方向吗？

brew install imagemagick --disable-openmp