X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=m4%2Fextensions.m4;h=49760791865fb81bb80f0e649d8a72bddfc0cd04;hb=ad7e0cc967251bc0d09999503a51e5fbcfac021d;hp=51394b5c84ff44c7b7e7768b99368f6071a42ca6;hpb=96ea077f709ca3f459bab2978b5ae4d399c71fe0;p=gnulib.git

diff --git a/m4/extensions.m4 b/m4/extensions.m4
index 51394b5c8..497607918 100644
--- a/m4/extensions.m4
+++ b/m4/extensions.m4
@@ -5,6 +5,9 @@
 # gives unlimited permission to copy and/or distribute it,
 # with or without modifications, as long as this notice is preserved.
 
+# This file is only needed in autoconf <= 2.59.  Newer versions of autoconf
+# have a macro AC_USE_SYSTEM_EXTENSIONS with identical semantics.
+
 # gl_USE_SYSTEM_EXTENSIONS
 # ------------------------
 # Enable extensions on systems that normally disable them,