Hi Piero, Did you install the developer tool package? IIRC you can install it from the Mac OS X installation DVD. (You can check this by running 'gcc' on the terminal, if you see 'command not found' you don't have the developer tool package.) HTH, Laurent On 1/5/07, pierodancona / gmail.com <pierodancona / gmail.com> wrote: > Sorry for the stupid question. I am trying to build > rubyOSA 0.2.0 on my Mac Powerbook, OS X.4.8. > When I run "ruby extconf.rb", following the instructions, > I get the answer "can't find header files for ruby". > When you stop laughing, please, tell me: what should I do? > > Thanks a lot, > Piero > > >