diff -urN autoconf-2.61.org/lib/autoconf/functions.m4 autoconf-2.61/lib/autoconf/functions.m4
--- autoconf-2.61.org/lib/autoconf/functions.m4	2006-10-15 03:12:02.000000000 +0200
+++ autoconf-2.61/lib/autoconf/functions.m4	2006-12-21 01:45:53.141722500 +0100
@@ -799,7 +799,7 @@
 # -lseq on Dynix/PTX, -lgen on Unixware.
 AC_SEARCH_LIBS(getmntent, [sun seq gen],
 	       [ac_cv_func_getmntent=yes
-		AC_DEFINE([HAVE_GETMNTENT], [],
+		AC_DEFINE([HAVE_GETMNTENT], 1,
 			  [Define to 1 if you have the `getmntent' function.])],
 	       [ac_cv_func_getmntent=no])
 ])