diff --git a/config/ChangeLog b/config/ChangeLog
index 4cf0ccc0156..4ef6a036229 100644
--- a/config/ChangeLog
+++ b/config/ChangeLog
@@ -1,3 +1,7 @@
+2008-02-20  Uros Bizjak  <ubizjak@gmail.com>
+
+	* mh-ppc-darwin (BOOT_CFLAGS): Use +=, not =.
+
 2008-02-20  Paolo Bonzini  <bonzini@gnu.org>
 
 	PR bootstrap/32009
diff --git a/config/mh-ppc-darwin b/config/mh-ppc-darwin
index ad43bca6c0a..66f68b664a9 100644
--- a/config/mh-ppc-darwin
+++ b/config/mh-ppc-darwin
@@ -2,4 +2,4 @@
 # position-independent-code -- the usual default on Darwin. This fix speeds
 # compiles by 3-5%.
 
-BOOT_CFLAGS=-g -O2 -mdynamic-no-pic
+BOOT_CFLAGS += -mdynamic-no-pic