/usr/lib64/graphviz/libgvplugin_gd.so.6.0.0 links to libltdl.so.7
should be all set now in the tree; thanks for the report! Commit message: Add libtool to depend since we link against ltdl http://sources.gentoo.org/media-gfx/graphviz/graphviz-2.36.0.ebuild?r1=1.3&r2=1.4