If you plan to call C programs from ACUCOBOL-85 or ACUCOBOL-GT, you will need to link your C routines into the runtime. To execute the link, you must have the appropriate C compiler for your host machine.
On MS-DOS systems with extended memory management (ACUCOBOL-85 and ACUCOBOL-GT for 80386 MS-DOS), use Watcom's C/C++32, Version 10.0, or later.
On MS-Windows 3.x systems, use Microsoft Visual C++, version 1.5.
On MS-Windows 95 and Windows NT (Intel) systems, use Microsoft Visual C++, version 6.0.
On UNIX systems, use the C compiler supplied by the vendor of your UNIX system. On some machines, this is supplied with UNIX, on others it is an add-on option.
Before relinking, modify "direct.c" (direct method) or "sub.c" and "sub85.c" (interface method) to include your C routines (see Appendix C in the documentation for the compiler).