diff -up xulrunner-1.9.2.1/mozilla-1.9.2/js/src/shell/js.cpp.sbrk xulrunner-1.9.2.1/mozilla-1.9.2/js/src/shell/js.cpp
--- xulrunner-1.9.2.1/mozilla-1.9.2/js/src/shell/js.cpp.sbrk	2010-01-06 04:35:17.000000000 +0100
+++ xulrunner-1.9.2.1/mozilla-1.9.2/js/src/shell/js.cpp	2010-01-13 21:49:33.000000000 +0100
@@ -1119,7 +1119,7 @@ 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)rt->gcBytes,
-#ifdef HAVE_SBRK
+#if 0
                 (unsigned long)sbrk(0)
 #else
                 0
diff -up xulrunner-1.9.2.1/mozilla-1.9.2/js/src/xpconnect/shell/xpcshell.cpp.sbrk xulrunner-1.9.2.1/mozilla-1.9.2/js/src/xpconnect/shell/xpcshell.cpp
--- xulrunner-1.9.2.1/mozilla-1.9.2/js/src/xpconnect/shell/xpcshell.cpp.sbrk	2010-01-06 04:35:19.000000000 +0100
+++ xulrunner-1.9.2.1/mozilla-1.9.2/js/src/xpconnect/shell/xpcshell.cpp	2010-01-13 22:32:46.000000000 +0100
@@ -543,7 +543,7 @@ 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