Hi, what do you think about a macgem with mixed-in ObjC? This could be useful for supporting native C libraries without using the MRI C interface, for calling parts of the OS X framework that is not Obj-C, for speed optimized code and so on..... A macgem could also be delivered with a precompiled .rbo, so it can easily be installed on machines without the Developer tools installed. (I haven't yet tried to run macruby on such a machine ;-) ) BTW, I failed in building an .rbo bundle with a mixed-in ObjC part. Pure Ruby like this macrubyc --arch x86_64 -C "foo.rb" -o "output/foo.rbo" is working, but I didn't find a way to include another .o file generated by gcc. Bernd