gfortran x65

Hi guys, I am new here

I was trying to run a fortran code in my Matlab R2014b using the mex command "mex -v file.f" but Matlab complained in this way:

Error using mex

Undefined symbols for architecture x86_64:

"_mexfunction_", referenced from:

-exported_symbol[s_list] command line option

ld: symbol(s) not found for architecture x86_64

clang: error: linker command failed with exit code 1 (use -v to see invocation)

do you know if there is a working gfortran x64 for mac Yosemithe?

Thank you so much!