> use iso_c_binding > 1 > Fatal Error: Can't open module file 'iso_c_binding.mod' for reading at (1): No > such file or directory You need the development version of gfortran to use ISO_C_BINDING (the branch that will, with time, become 4.3.0); binaries can be found at http://gcc.gnu.rg/wiki/GFortranBinaries . FX