Fix typo causing LIBS to become mangled

diff --git a/m4/pdns_check_readline.m4 b/m4/pdns_check_readline.m4
index 14aef0d5f5a4c1bc0382397cd7b4cea6f1ef8264..ad5f9750a5f33bbe435599b97afb080e409a80c4 100644 (file)
--- a/m4/pdns_check_readline.m4
+++ b/m4/pdns_check_readline.m4
@@ -3,7 +3,7 @@ AC_DEFUN([PDNS_CHECK_READLINE], [
   LIBS=""
   AX_LIB_READLINE
   AC_SUBST([READLINE_LIBS], [$LIBS])
-  LIBS="$OLDLIBS"
+  LIBS="$OLD_LIBS"
   AS_IF([test "$1" = "mandatory"],[
     AS_IF([test x"$READLINE_LIBS" = "x"],[
       AC_MSG_ERROR([readline support is mandatory])