--- old/src/cpu/zero/vm/frame_zero.cpp	2017-06-28 09:41:04.146301865 -0400
+++ new/src/cpu/zero/vm/frame_zero.cpp	2017-06-28 09:41:03.811480071 -0400
@@ -444,4 +444,6 @@
 frame::frame(void* sp, void* fp, void* pc) {
   Unimplemented();
 }
+
+void frame::pd_ps() {}
 #endif