diff -pur gmp-6.3.0/configure.ac gmp-6.3.0-new/configure.ac
--- gmp-6.3.0/configure.ac	2023-07-31 12:21:45
+++ gmp-6.3.0-new/configure.ac	2023-07-31 12:26:46
@@ -2088,7 +2088,7 @@ case $host in
   # Special CPU "none" used to select generic C, now this is obsolete.
   none-*-*)
     enable_assembly=no
-    AC_MSG_WARN([the \"none\" host is obsolete, use --disable-assembly])
+    AC_MSG_WARN([the "none" host is obsolete, use --disable-assembly])
     ;;
 
 esac
@@ -4048,10 +4048,8 @@ GMP_FINISH
 GMP_FINISH
 
 # Create Makefiles
-# FIXME: Upcoming version of autoconf/automake may not like broken lines.
-#        Right now automake isn't accepting the new AC_CONFIG_FILES scheme.
 
-AC_OUTPUT(Makefile							\
+AC_CONFIG_FILES([Makefile						\
   mpf/Makefile mpn/Makefile mpq/Makefile				\
   mpz/Makefile printf/Makefile scanf/Makefile rand/Makefile cxx/Makefile \
   tests/Makefile tests/devel/Makefile					\
@@ -4060,7 +4058,8 @@ AC_OUTPUT(Makefile							\
   tests/cxx/Makefile							\
   doc/Makefile tune/Makefile						\
   demos/Makefile demos/calc/Makefile demos/expr/Makefile		\
-  gmp.h:gmp-h.in gmp.pc:gmp.pc.in gmpxx.pc:gmpxx.pc.in)
+  gmp.h:gmp-h.in gmp.pc:gmp.pc.in gmpxx.pc:gmpxx.pc.in])
+AC_OUTPUT
 
 AC_MSG_NOTICE([summary of build options: