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f2c can be used to generate suitable code for compilation with a C++ system using the -C++ option. The important thing about linking g77-compiled code with C++ is that the prototypes for the g77 routines must specify C linkage to avoid name mangling. So, use an `extern "C"' declaration. f2c's -C++ option will not take care of this when generating skeletons or prototype files as above, however, it will avoid clashes with C++ reserved words in addition to those in C.