diff --git a/ChangeLog b/ChangeLog
index 3041ff0c82..f6be1143a0 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+2006-03-09	Ralf Corsepius <ralf.corsepius@rtems.org>
+
+	* acinclude.m4: Requires autoconf-2.59.
+
 2006-03-07	Joel Sherrill <joel@OARcorp.com>
 
 	PR 694/rtems
diff --git a/acinclude.m4 b/acinclude.m4
index 1115a6b666..3767cd1a3e 100644
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -3,7 +3,7 @@
 ## ${TARGET_CONFIGDIRS_LIST} is directories we build using the target tools.
 ## ${BUILD_CONFIGDIRS_LIST} is directories we build using the build tools
 
-AC_PREREQ(2.57)
+AC_PREREQ(2.59)
 
 dnl RTEMS_ARG_VAR(VAR,HELP-STRING)
 dnl An internal macros to have help strings pretty