diff -Naur parted-1.8.8-lunar/m4/extensions.m4 parted-1.8.8/m4/extensions.m4
--- parted-1.8.8-lunar/m4/extensions.m4	2006-10-12 10:01:18.000000000 +0200
+++ parted-1.8.8/m4/extensions.m4	2008-10-11 18:02:27.000000000 +0200
@@ -16,6 +16,7 @@
 # ------------------------
 # Enable extensions on systems that normally disable them,
 # typically due to standards-conformance issues.
+m4_ifndef([AC_USE_SYSTEM_EXTENSIONS],[
 AC_DEFUN([AC_USE_SYSTEM_EXTENSIONS],
 [
   AC_BEFORE([$0], [AC_COMPILE_IFELSE])
@@ -49,7 +50,7 @@
   AC_DEFINE([_POSIX_PTHREAD_SEMANTICS])
   AC_DEFINE([_TANDEM_SOURCE])
 ])
-
+])
 # gl_USE_SYSTEM_EXTENSIONS
 # ------------------------
 # Enable extensions on systems that normally disable them,