Index: check-0.9.6/configure.ac
===================================================================
--- check-0.9.6.orig/configure.ac
+++ check-0.9.6/configure.ac
@@ -17,6 +17,8 @@ AC_CONFIG_AUX_DIR([build-aux])
 # really severe build strictness
 AM_INIT_AUTOMAKE([-Wall -Werror gnits 1.9.6])
 
+AC_USE_SYSTEM_EXTENSIONS
+
 # FIXME: find the other places this stuff is used
 
 CHECK_MAJOR_VERSION=0