ghostscript-afpl 8.53-r1 aborts with certain PS files because of a known bug that has been fixed in their development trunk, which may not see the light of day as an official release for some time. See http://bugs.ghostscript.com/show_bug.cgi?id=688422 Perhaps Gentoo's ebuild incorporate the patch workaround as posted at http://ghostscript.com/pipermail/gs-cvs/2005-December/005834.html Thanks for considering this.
Problem confirmed and patched up in cvs. Thanks!