You can run the Header-to-copy utility directly from the command line or invoke it automatically using the PREPROCESS(headers) Compiler directive. The Headers preprocessor allows C header files, with an extension of .h, to be specified in a COPY statement in a COBOL source file. The preprocessor recognizes these as C header files and uses the Header-to-copy utility to convert them. This can be very convenient for relatively small header files.
See Converting Header Files Using the H2cpy Utility in the Programming folder for full details.