Xcode 4 and non-C compilers

In one of my Xcode projects, I have a single source file in Fortran (the rest are C++), and am trying to find some way of convincing Xcode to compile it. Compiling and linking (even using Clang) work just fine via command-line.

My initial thought was to add the .f95 file to the "Compile Sources" build phase, then add a build rule that processes Fortran source files with gfortran, but it doesn't even show up in the build log. Anyone have any thoughts on the matter?

 

My question isn't Fortran-specific, it could apply to any compiled language unsupported by Xcode. The compiler I've gotten from the R site, but it doesn't add anything to Xcode.