$srcdir suffices.

It's "the name of the top source directory, assuming that the working
directory is the top build directory"; when running the configure
script, the working directory will, in fact, be the top build directory.

1 files changed, 1 insertions, 1 deletions

diff --git a/configure b/configure
index ade0e52b..abda7ae4 100755
--- a/configure
+++ b/configure
@@ -9124,7 +9124,7 @@ $as_echo "$as_me: executing $ac_file commands" >&6;}
   case $ac_file$ac_mode in
     "default-1":C) if test -f .devel; then
 	echo timestamp > stamp-h
-	cat $ac_top_srcdir/Makefile-devel-adds >> Makefile
+	cat $srcdir/Makefile-devel-adds >> Makefile
 	make depend
 fi ;;