OpenMP for Mac OS X: The default clang compiler on OS X does not support OpenMP. Since gcc on OS X is just a symbolic link to clang, using the default gcc/g will not work either. We need to install the latest homebrew version of gcc (e.g. V6.x) and add its location to the PATH environment variable: brew install gcc export PATH=/usr/local/bin. Binaries: g77-bin.tar.gz (PowerPC only), g77-intel-bi..