https://bugs.archlinux.org/task/33397

diff -aur old/main.c new/main.c
--- main.c	2013-01-14 18:16:14.216210053 -0600
+++ main.c	2013-01-14 18:17:28.816220559 -0600
@@ -833,7 +833,8 @@
     mySignal(SIGPIPE, SigPipe);
 #endif

-    orig_GC_warn_proc = GC_set_warn_proc(wrap_GC_warn_proc);
+    orig_GC_warn_proc = GC_get_warn_proc();
+    GC_set_warn_proc(wrap_GC_warn_proc);
     err_msg = Strnew();
     if (load_argc == 0) {
	/* no URL specified */
