A FORTRAN 77 to C/C++ translator f2c translates FORTRAN 77 (with some extensions) into C, so that it can then be compiled and run on a system with no Fortran compiler. The C files must then be linked against the appropriate libraries. This is an actively maintained FORTRAN to C translator and with the fort77 frontend provides an ideal way to compile FORTRAN routines as black boxes (for example for invocation from C). Source level debugging facilities are not available, and error messages are not as well developed as in g77.