diff --git a/boehm-gc/ChangeLog b/boehm-gc/ChangeLog
index 5e39dd05778..180f111067f 100644
--- a/boehm-gc/ChangeLog
+++ b/boehm-gc/ChangeLog
@@ -1,3 +1,8 @@
+Fri Jan 28 17:13:20 2000  Anthony Green  <green@cygnus.com>
+
+	* gcconfig.h (DATASTART): Add missing extern declaration
+	for data_start on powerpc.
+
 1999-12-22  Bryce McKinlay  <bryce@albatross.co.nz>
 
 	* linux_threads.c: Don't block SIGINT, SIGQUIT, SIGTERM in the
diff --git a/boehm-gc/gcconfig.h b/boehm-gc/gcconfig.h
index 9451aab3770..25178d095ec 100644
--- a/boehm-gc/gcconfig.h
+++ b/boehm-gc/gcconfig.h
@@ -532,6 +532,7 @@
 #     undef STACK_GRAN
 #     define STACK_GRAN 0x10000000
 	/* Stack usually starts at 0x80000000 */
+      extern int data_start;
 #     define DATASTART (&data_start)
       extern int _end;
 #     define DATAEND (&_end)