(AS_IF): Use m4_default.

diff --git a/lib/m4sugar/m4sh.m4 b/lib/m4sugar/m4sh.m4
index ef5ccef1fed89e44b3e92ea09fd9d3e253424dc8..6bfde3beaf15355604828e2ef70eeb67abe2de26 100644 (file)
--- a/lib/m4sugar/m4sh.m4
+++ b/lib/m4sugar/m4sh.m4
@@ -451,7 +451,7 @@ m4_define([AS_EXIT],
 m4_defun([AS_IF],
 [m4_ifval([$2$3],
 [if $1; then
-  m4_ifval([$2], [$2], :)
+  m4_default([$2], [:])
 m4_ifvaln([$3],
 [else
   $3])dnl