diff --git a/boehm-gc/ChangeLog b/boehm-gc/ChangeLog
index f097c715026926d1f9a543793ea746e3998d6db5..abdbe6b7127a6c8b8563f165030f402d2bfd8064 100644
--- a/boehm-gc/ChangeLog
+++ b/boehm-gc/ChangeLog
@@ -1,3 +1,7 @@
+2004-11-27  Bryce McKinlay  <mckinlay@redhat.com>
+
+	* include/gc_config.h.in: Add comment. Define only THREAD_LOCAL_ALLOC.
+
 2004-11-26  Bryce McKinlay  <mckinlay@redhat.com>
 
 	Fix "PACKAGE_NAME redefined" errors.
diff --git a/boehm-gc/include/gc_config.h.in b/boehm-gc/include/gc_config.h.in
index c0f62482b5d74e6f00957272ef67c16297773525..e236c5745bae97da89fab99d75108cd93552a9f5 100644
--- a/boehm-gc/include/gc_config.h.in
+++ b/boehm-gc/include/gc_config.h.in
@@ -1,3 +1,7 @@
-#undef ALL_INTERIOR_POINTERS
-#undef GC_GCJ_SUPPORT
+/* gc_config.h. This autoconf header contains macro definitions that are
+used by GC clients, such as libjava. 
 
+This file is not generated by autoheader. We only want to define what we
+really need in order to avoid namespace pollution. */
+
+#undef THREAD_LOCAL_ALLOC