diff --git a/pack.c b/pack.c
index 5b9c4d81d8..91f3eb5b2a 100644
--- a/pack.c
+++ b/pack.c
@@ -30,6 +30,7 @@
 
 #ifdef DYNAMIC_ENDIAN
  /* for universal binary of NEXTSTEP and MacOS X */
+ /* useless since autoconf 2.63? */
  static int
  is_bigendian(void)
  {