I know this is not exactly a programming question but I am working with MATLAB MEX files and was wondering if anyone knows how to get a mex file to compile in matlab. I have tried mex -setup and selected various compilers but I cannot compile successfully. For example, I get the following error: >> mex yprime.c /Applications/MATLAB74/bin/mex: line 1025: gcc-4.0: command not found /Applications/MATLAB74/bin/mex: line 1004: gcc-4.0: command not found mex: yprime.c not a normal file or does not exist. ??? Error using ==> mex at 206 Unable to complete successfully. 1. I would like to know how to setup the compiler in MATLAB 7.4 (R2007a) - (Xcode's compiler, I think?). I am running on a brand new Intel Mac (Signature) Thank you very much.