Compiling the Runtime System (RTS) on a System V compatible unix requires "-DSYSV" to be set in CFLAGS. `configure' recognizes a number of System V compatible unices, but not all.
If you see:
../srcdir/rts/rts-rt0.c: In function `_p_initialize': ../srcdir/rts/rts-rt0.c:286: `SIGEMT' undeclared (first use this function) ../srcdir/rts/rts-rt0.c:290: `SIGSYS' undeclared (first use this function)
while building `libgpc.a', you have to add "-DSYSV" to your MY_CFLAGS.
Example:
% make MY_CFLAGS=-DSYSV other-make-flags-you-want-to-use
Please send a report, with the canonical name of the system to `gpc@kampi.hut.fi'