* configure.in (AC_OUTPUT): Handle assignments to NATDEPFILES

using `+=' as well as `='.
* configure: Regenerated.

gdb/configure

@@ -9193,8 +9193,10 @@ EOF
 cat >> $CONFIG_STATUS <<\EOF
 
 if test "${nativefile}" = ""; then
-sed -e '/^NATDEPFILES[ 	]*=[ 	]*/s//# NATDEPFILES=/' \
-	< Makefile > Makefile.tem
+        < Makefile \
+        sed -e '/^NATDEPFILES[ 	]*=[ 	]*/s//# NATDEPFILES=/' \
+        | sed -e '/^\(NATDEPFILES[ 	]*[+]=[ 	]*\)/s//# \1/' \
+	> Makefile.tem
 mv -f Makefile.tem Makefile
 fi