
                    ######################################
                    Tinker Notes for GNU gfortran on macOS
                    ######################################

         This subdirectory contains a set of script files that can be
         used to build the Tinker program package on a macOS system
         using GNU gcc/gfortran compilers under OpenMP parallelization.
         Early versions of the GNU compilers, in particular before 4.7,
         do not work correctly due to lack of support for some features
         of the OpenMP standard.

         Building reasonably portable executables requires linking with
         static gcc libraries. This can be done via use of versions of
         gfortran that enforce the -static-libgcc flag, or by copying
         the static libraries from the gcc directories into the Tinker
         build directory, as noted in "link.make".

         Alternatively, on macOS the shared versions, libquadmath.dylib
         and libquadmath.0.dylib, can be moved or renamed from within
         the directory containing the compiler libraries.

