--- gforth/configure.in	2005/01/17 16:52:46	1.144
+++ gforth/configure.in	2005/01/22 16:39:58	1.146
@@ -39,6 +39,12 @@ AC_ARG_ENABLE(force-reg,
 			  but also incorrect code with some gcc versions on
 			  some processors (default disabled).],
 AC_DEFINE(FORCE_REG,,[Define if you want to use explicit register declarations for better performance or for more convenient CODE words (does not work with all GCC versions on all machines)]))
+AC_ARG_ENABLE(force-ll,
+[  --enable-force-ll	  Use explicit long long declarations if they appear in
+			  the machine.h file. This can cause a good speedup,
+			  but also incorrect code with some gcc versions on
+			  some processors (default disabled).],
+AC_DEFINE(FORCE_LL,,[Define if you want to use explicit long long declarations for better performance (does not work with all GCC versions on all machines)]))
 AC_SUBST(PROFEXES)
 AC_SUBST(PROFOBJS)
 AC_ARG_ENABLE(prof,
@@ -161,8 +167,6 @@ case "$host_cpu" in
 		;;
 	x86_64)
 		machine=amd64
-		ac_includes_default="$ac_includes_default
-#include \"arch/generic/128bit.h\""
 		;;
 	ia64*)
 		machine=ia64
@@ -224,6 +228,11 @@ case "$host_cpu" in
 esac
 AC_SUBST(host)
 
+if test "${enable_force_ll+set}" = set; then
+   ac_includes_default="$ac_includes_default
+#include \"arch/generic/128bit.h\""
+fi
+
 dnl the following macro produces a warning with autoconf-2.1
 AC_CHECK_SIZEOF(char *)
 case "$ac_cv_sizeof_char_p" in