Add pointer to GPL-free MP library
diff --git a/Modules/Setup.in b/Modules/Setup.in
index c27cd8d..0334069 100644
--- a/Modules/Setup.in
+++ b/Modules/Setup.in
@@ -119,7 +119,7 @@
#stdwin stdwinmodule.c -I$(STDWIN)/H $(STDWIN)/Build/$(ARCH)/x11/lib/lib.a -lX11
#STDWINPATH=:$(DESTLIB)/stdwin
-# For STDWIN 1.0 it's a bit different:
+# For STDWIN 0.9.9 or higher, it's a bit different:
#STDWIN=/ufs/guido/src/stdwin
#LIBTEXTEDIT=$(STDWIN)/$(MACHDEP)/Packs/textedit/libtextedit.a
@@ -147,6 +147,11 @@
# work OK, but I haven't tested it thoroughly (lacking knowledge about
# it).
+# A compatible MP library unencombered by the GPL also exists. It was
+# posted to comp.sources.misc in volume 40 and is widely available from
+# FTP archive sites. One URL for it is:
+# ftp://gatekeeper.dec.com/.b/usenet/comp.sources.misc/volume40/fgmp/part01.Z
+
#GMP=/ufs/guido/src/gmp
#mpz mpzmodule.c -I$(GMP) $(GMP)/libgmp.a