nokogiri - ERROR: Failed to build gem native extension

Question

I updated to the developer release of Lion and noticed I couldn\'t start rails apps anymore. Whenever I try to sudo bundle install, I get the following error:

Answer 1

It says: "can't find header files for ruby". In other words, you're missing the ruby headers in order to compile libxml/nokogiri as a ruby extension.

Consider installing ruby 1.9 (or 1.8) using macports or rvm. I'm not 100% on the second, but the first will automatically make the relevant headers available.