On various 386 Unix systems derived from System V, including SCO, ISC,
and ESIX, you may get error messages about running out of virtual memory
while compiling certain programs.
You can prevent this problem by linking GCC with the GNU malloc
(which thus replaces the malloc that comes with the system). GNU malloc
is available as a separate package, and also in the file
src/gmalloc.c in the GNU Emacs 19 distribution.
If you have installed GNU malloc as a separate library package, use this
option when you relink GCC:
Alternatively, if you have compiled gmalloc.c from Emacs 19, copy
the object file to gmalloc.o and use this option when you relink