The package installs some URW++ fonts which are provided under media-fonts/urw-fonts-2.4.6. These are: d050000l.pfb n019003l.pfb n019004l.pfb n019023l.pfb n019024l.pfb n021003l.pfb n021004l.pfb n021023l.pfb n021024l.pfb n022003l.pfb n022004l.pfb n022023l.pfb n022024l.pfb s050000l.pfb although media-fonts/urw-fonts-2.4.6 contains a lot more (basically the same but updated subset as plotutils-2.5.1/fonts/pfb/*.pfb but those from ploturils do not get installed, which is what I prefer).
Looks fixed in 0.9.1
Probably resolved through the work on bug #256088.