I just tried, several times, to install gpc under Mingwin. I fail every time in the same way: when I launch gpc, it does not find its own parts.
1) I get a message <<cannot exec /mingw/lib.....>> even though the required exe does exist, precisely where gpc looks for it I have a dirty workaround for this problem: if I do not set GPC_EXEC_PREFIX but put the directory /mingw/lib/gcc-lib/mingw32/2.95.3-6 in the path the executables are found. I then fall on the second problem
2) Units are not found (crt, gpc, etc...)
My last attempt was with a fresh Mingwin distribution, specially downloaded form the mingwin site, with just the same version number as the gpc package, so I do not know what to do.
There is no problem with the djgpp version (well, almost: the crt unit does not display accented letters !)