--- tiff-3.7.0/configure.ac.orig	2004-10-16 13:05:25 +0400
+++ tiff-3.7.0/configure.ac	2004-10-25 00:21:37 +0400
@@ -32,6 +32,7 @@
 AC_CANONICAL_TARGET
 
 AM_INIT_AUTOMAKE
+AC_GNU_SOURCE
 AM_PROG_CC_C_O
 dnl Do not rebuild generated files every time
 AM_MAINTAINER_MODE