sci-misc/gri-2.12.13 depends on app-text/ghostscript-esp but should depend on virtual/ghostscript. The different ghostscript implementations block each other since virtual/ghostscript became stable. Depending directly on ghostscript-esp is very likely not necessary for gri.
*** This bug has been marked as a duplicate of 158380 ***
Dupe.
Sorry folks, was right before my nose and I overlooked it :\