--- a/configure.ac	Thu Feb 04 22:31:38 2016 +0100
+++ b/configure.ac	Thu Feb 04 22:31:40 2016 +0100
@@ -42,8 +42,8 @@
 AC_PROG_CC([cc gcc])
 AC_ISC_POSIX
 AC_HEADER_STDC
-# automake warns about not using AM_PROG_AR
-# but automake <= 1.11 doesn't recognize it
+dnl automake warns about not using AM_PROG_AR
+dnl but automake <= 1.11 doesn't recognize it
 m4_ifdef([AM_PROG_AR], [AM_PROG_AR])
 AC_LIBTOOL_WIN32_DLL
 AM_PROG_LIBTOOL