gfortran from HPC.sf.net needs gcc as well, as pointed out by @HarlanH.

tknopp · Aug 30, 2012 · a0e4d6d · a0e4d6d
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@@ -79,7 +79,7 @@ On Ubuntu systems, You may also need to install the package `libncurses5-dev`.
 
 #### OS X
 
-Download and install [gfortran from hpc.sf.net](http:https://hpc.sf.net/), if necessary. It is essential that you use a 64-bit gfortran.
+It is essential to use a 64-bit gfortran. Download and install [gfortran and gcc from hpc.sf.net](http:https://hpc.sf.net/), if necessary. The HPC gfortran requires gcc to function properlyl.
 
 If you get link errors mentioning `gfortran`, it might help to put `/usr/local/gfortran/lib` at the beginning of the `DYLD_LIBRARY_PATH` environment variable.