Coherent was published by Mark-Williams, who also had their own C compiler (MWC), which was also available for CP/M86 and the Atari ST. It's a K&R compiler, so

Coherent was published by Mark-Williams, who also had their own C compiler (MWC), which was also available for CP/M86 and the Atari ST. It's a K&R compiler, so expect some trouble with compiling modern code (unprotoize might help a bit here). The final releases of Coherent (4.2 is the last one IIRC) also fully supported the iBCS COFF binary standard, so binaries compiled for e.g. SCO Unix might work. You could also try to build an old gcc version with the provided K&R compiler: https://www.autometer.de/unix4fun/coherent/coh_prog.html https://www.autometer.de/unix4fun/coherent/coh_prog.html