root@vt / # root@vt etc # emerge grace Calculating dependencies \!!! Error merging /usr/portage/media-gfx/grace/grace-5.1.7-r1.ebuild: invalid dependency in: 'virtual/x11 >=x11-libs/openmotif-2.1 media-libs/libpng-0.96 >=media-libs/tiff-3.5 pdflib? ( >=media-libs/pdflib-3.0.2 ) virtual/x11 >=x11-libs/openmotif-2.1 media-libs/libpng-0.96 >=media-libs/tiff-3.5 pdflib? ( >=media-libs/pdflib-3.0.2 )' >>> Please report this ebuild error to http://bugs.gentoo.org.
Thanks for that catch.