diff -up xulrunner2-2.0/mozilla-central/js/src/shell/js.cpp.sbrk xulrunner2-2.0/mozilla-central/js/src/shell/js.cpp
--- xulrunner2-2.0/mozilla-central/js/src/shell/js.cpp.sbrk	2010-07-20 20:52:15.000000000 -0400
+++ xulrunner2-2.0/mozilla-central/js/src/shell/js.cpp	2010-07-28 10:21:51.905606001 -0400
@@ -1118,7 +1118,7 @@ GC(JSContext *cx, uintN argc, jsval *vp)
     char buf[256];
     JS_snprintf(buf, sizeof(buf), "before %lu, after %lu, break %08lx\n",
                 (unsigned long)preBytes, (unsigned long)cx->runtime->gcBytes,
-#ifdef HAVE_SBRK
+#if 0
                 (unsigned long)sbrk(0)
 #else
                 0
diff -up xulrunner2-2.0/mozilla-central/js/src/xpconnect/shell/xpcshell.cpp.sbrk xulrunner2-2.0/mozilla-central/js/src/xpconnect/shell/xpcshell.cpp
--- xulrunner2-2.0/mozilla-central/js/src/xpconnect/shell/xpcshell.cpp.sbrk	2010-07-20 20:52:20.000000000 -0400
+++ xulrunner2-2.0/mozilla-central/js/src/xpconnect/shell/xpcshell.cpp	2010-07-28 10:20:36.878606001 -0400
@@ -540,7 +540,7 @@ GC(JSContext *cx, JSObject *obj, uintN a
     JS_GC(cx);
     fprintf(gOutFile, "before %lu, after %lu, break %08lx\n",
            (unsigned long)preBytes, (unsigned long)rt->gcBytes,
-#if defined(XP_UNIX) && !defined(__SYMBIAN32__)
+#if 0 //defined(XP_UNIX) && !defined(__SYMBIAN32__)
            (unsigned long)sbrk(0)
 #else
            0