Muttprint uses the perl module File::Temp. This module is not a part of the
base system. But this dependency is not indicated in the port's Makefile.
So the port Muttprint can be installed even if File::Temp is missing but it
will fail to work.
Fix: Just add that dependency:
Try to build and run the muttripnt on the system with no p5-File-Temp installed.
Over to maintainer.