Upgraded my ruby environment today to Mountain Lion. Here is a quick checklist that I went through to get everything working. The largest change was having to reinstall XCode and command line tools, and also download XQuarts in order to reinstall ImageMagick successfully. Without it, I was getting errors building RMagick of the following shape: ld: file not found: /usr/lib/libltdl.7.dylib for architecture x86_64 clang: error: linker command failed with exit code 1 (use -v to see invocation) make: *** [RMagick2.bundle] Error 1 Quick checklist: Install Mountain Lion Install XCode 4.4 Install command line tools from XCode 4.4 Preferences dialog Install XQuartz In terminal run brew update brew uninstall imagemagick brew install --fresh imagemagick wipe out your ~/.rvm folder reinstall RVM and install the latest ruby 1.9.3-p-194 run "bundle" in the project folder run "rake" and rejoice References: https://github.com/mroth/lolcommits/issu
Tech ramblings by Konstantin Gredeskoul