diff --git a/configure/os/CONFIG.darwin-ppc.darwin-ppc b/configure/os/CONFIG.darwin-ppc.darwin-ppc
index 818ae5342..02f4b278b 100644
--- a/configure/os/CONFIG.darwin-ppc.darwin-ppc
+++ b/configure/os/CONFIG.darwin-ppc.darwin-ppc
@@ -21,7 +21,9 @@ CODE_CFLAGS =
 CODE_CXXFLAGS = 
 
 #
-# -O3 is too agressive on Darwin with the April, 2002 Developer Tools
+# -O3 is too agressive on Darwin with the April 2002 Developer Tools 
+# and causes problems with undefined references to non-virtual thunks
+# with the August 2002 Developer Tools.
 #
 OPT_CFLAGS_YES = -O2
 OPT_CXXFLAGS_YES = -O2