gcc mac os x 10.7.2

Hello,

I have recently migrated to a Mac with Matlab 2011a and Xcode 4 and I am having issues running a Simulink model that was developed using Matlab 2008a. The error message that I get is:

Making simulation target "EDAR_sfun", ... /Applications/MATLAB_R2011a.app/bin/mex -c -O -DMATLAB_MEX_FILE -I/Applications/MATLAB_R2011a.app/toolbox/stateflow/stateflow/../../../simulink/include -I/Applications/MATLAB_R2011a.app/toolbox/stateflow/stateflow/../../../extern/include -I/Applications/MATLAB_R2011a.app/stateflow/c/mex/include -I/Applications/MATLAB_R2011a.app/stateflow/c/debugger/include EDAR_sfun.c /Applications/MATLAB_R2011a.app/bin/mex: line 305: gcc-4.2: command not found /Applications/MATLAB_R2011a.app/bin/mex: line 1041: gcc-4.2: command not found mex: compile of ' "EDAR_sfun.c"' failed. gmake: * [EDAR_sfun.o] Error 1

I have tried the solution posted here:

http://www.mathworks.com/matlabcentral/answers/14222-mex-can-t-find-gcc-in-path

But I have the following message:

/usr/bin/gcc-4.2: File exists

Which is probably because I did it twice and it actually worked the first one.

Does anybody know how to fix this problem?

Thank you very much,

Gonzalo