As of today, emulators/mupen64plus* ports do not support staging despite mandatory usage required before end of june 2014.
Fix: Here's a exhaustive patch for all the concerned ports.
How-To-Repeat: make stage in any of the emulators/mupen64plus* directories
Over to maintainer (via the GNATS Auto Assign Tool)
maintainer has been reset on all ports, move to patch-ready (untested, take at your own risk)
A commit references this bug:
Date: Thu Aug 14 22:05:57 UTC 2014
New revision: 364872
Stage all emulators/mupen64plus ports
Submitted by: Matthieu Volat
Tweaks by: marino
This only covered 11 ports, a bit of tweaking was needed to get all 13 to build, but poudriere is happy now.