Document the need for 64-bit gfortran on a mac in the README.

tknopp · Aug 24, 2012 · 2767d99 · 2767d99
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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.
+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.
 
 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.