I just tracked down a bug which killed any other applications from building ruby extensions; e.g. vim with --enable-rubyinterp This is ruby-1.7.1 from yesterday's CVS (Aug 5). Bug is in mkmf.rb: This is the buggy original: CONFIG = Config::MAKEFILE_CONFIG Change it to: CONFIG = Config::CONFIG A trivial bug once you find it, but this will prevent other applications in finding "ruby.h" properly... -- Wai-Sun "Squidster" Chia Linux/Unix/Web Developer/RHCE Professional Services