Use the FSF m4 instead of the BSD m4, because the BSD m4 is reporting problems
processing config.c.in.

--- Makefile.in	Mon Aug 18 14:52:43 1997
+++ Makefile.in	Tue Aug 26 14:14:44 1997
@@ -68,7 +68,7 @@
 HOST_PREFIX_1 = loser-
 
 # These flag values are normally overridden by the configure script.
-CFLAGS = -g
+CFLAGS+= -g
 CXXFLAGS = -g -O2
 
 LIBCFLAGS = $(CFLAGS)
@@ -121,7 +121,7 @@
 
 M4 = `if [ -f $$r/m4/m4 ] ; \
 	then echo $$r/m4/m4 ; \
-	else echo m4 ; fi`
+	else echo gm4 ; fi`
 
 MAKEINFO = `if [ -f $$r/texinfo/makeinfo/Makefile ] ; \
 	then echo $$r/texinfo/makeinfo/makeinfo ; \