diff --git a/boehm-gc/ChangeLog b/boehm-gc/ChangeLog
index fc5cbe746a9..77b23fc1db4 100644
--- a/boehm-gc/ChangeLog
+++ b/boehm-gc/ChangeLog
@@ -1,3 +1,9 @@
+2003-04-09  Tom Tromey  <tromey@redhat.com>
+
+	* include/private/gcconfig.h (LINUX_STACKBOTTOM): Define for
+	POWERPC.
+	(STACK_GRAN, HEURISTIC1): Don't define for POWERPC.
+
 2003-03-22  Richard Henderson  <rth@redhat.com>
 
 	* include/private/gc_locks.h [IA64]: Include ia64intrin.h.
diff --git a/boehm-gc/include/private/gcconfig.h b/boehm-gc/include/private/gcconfig.h
index 51d9de0186c..b07d4b9a18e 100644
--- a/boehm-gc/include/private/gcconfig.h
+++ b/boehm-gc/include/private/gcconfig.h
@@ -669,10 +669,8 @@
 #     define ALIGNMENT 4	/* Guess.  Can someone verify?	*/
 				/* This was 2, but that didn't sound right. */
 #     define OS_TYPE "LINUX"
-#     define HEURISTIC1
 #     define DYNAMIC_LOADING
-#     undef STACK_GRAN
-#     define STACK_GRAN 0x10000000
+#     define LINUX_STACKBOTTOM
 	/* Stack usually starts at 0x80000000 */
 #     define LINUX_DATA_START
       extern int _end[];