Ruby/Other: Fix for missing header files on Mac OSX 10.6
Having trouble installing certain Ruby gems (mysql) on Mac OSX 10.6? MacPorts ?
Error message similar to this?:
mkmf.rb can’t find header files for ruby at /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/ruby.h
Solution: Reinstall Xcode. To verify this problem, you can run ‘which make’ from terminal and most likely you will receive no response if you are getting the missing header file error.