diff --git a/jtag/ChangeLog b/jtag/ChangeLog
index ffcad78f..ed62bac2 100644
--- a/jtag/ChangeLog
+++ b/jtag/ChangeLog
@@ -1,3 +1,7 @@
+2003-01-19  Marcel Telka  <marcel@telka.sk>
+
+	* configure.ac: Added AC_GNU_SOURCE.
+
 2003-01-18  Marcel Telka  <marcel@telka.sk>
 
 	* src/jtag.c (main): Added new 'frequency' command.
diff --git a/jtag/configure.ac b/jtag/configure.ac
index e319227d..4851d88c 100644
--- a/jtag/configure.ac
+++ b/jtag/configure.ac
@@ -23,7 +23,7 @@
 
 AC_INIT(jtag,0.2.1)
 
-AC_PREREQ(2.53)
+AC_PREREQ(2.54)
 AC_COPYRIGHT([Copyright (C) 2002, 2003 ETC s.r.o.])
 AC_REVISION($Revision$)
 
@@ -42,6 +42,8 @@ AC_CONFIG_FILES(
 
 AM_MAINTAINER_MODE
 
+AC_GNU_SOURCE
+
 AC_PROG_CC
 AC_PROG_RANLIB