--- a/libgcc/configure.ac	Sun Feb 07 18:28:00 2010 +0900
+++ b/libgcc/configure.ac	Fri Feb 12 23:39:51 2010 +0900
@@ -6,7 +6,7 @@
 sinclude(../config/no-executables.m4)
 sinclude(../config/override.m4)
 
-AC_PREREQ(2.59)
+AC_PREREQ(2.64)
 AC_INIT([GNU C Runtime Library], 1.0,,[libgcc])
 AC_CONFIG_SRCDIR([static-object.mk])
 
@@ -78,6 +78,21 @@
 fi)
 AC_SUBST(slibdir)
 
+# Command-line options.
+# Very limited version of AC_MAINTAINER_MODE.
+AC_ARG_ENABLE([maintainer-mode],
+  [AC_HELP_STRING([--enable-maintainer-mode],
+                 [enable make rules and dependencies not useful (and
+                  sometimes confusing) to the casual installer])],
+  [case ${enable_maintainer_mode} in
+     yes) MAINT='' ;;
+     no) MAINT='#' ;;
+     *) AC_MSG_ERROR([--enable-maintainer-mode must be yes or no]) ;;
+   esac
+   maintainer_mode=${enableval}],
+  [MAINT='#'])
+AC_SUBST([MAINT])dnl
+
 AC_PROG_INSTALL
 
 AC_PROG_AWK