I believe /usr/local is not a place for ebuild installed files. But xv installs some doc files to /usr/local: $ equery files xv [ Searching for packages matching xv... ] * Contents of media-gfx/xv-3.10a-r13: /usr /usr/bin /usr/bin/bggen /usr/bin/vdcomp /usr/bin/xcmap /usr/bin/xv /usr/bin/xvpictoppm /usr/local /usr/local/share /usr/local/share/doc /usr/local/share/doc/xv /usr/local/share/doc/xv/README.jumbo /usr/local/share/doc/xv/xvdocs.pdf /usr/local/share/doc/xv/xvdocs.ps /usr/share /usr/share/doc /usr/share/doc/xv-3.10a-r13 /usr/share/doc/xv-3.10a-r13/BUGS.bz2 /usr/share/doc/xv-3.10a-r13/CHANGELOG.bz2 /usr/share/doc/xv-3.10a-r13/IDEAS.bz2 /usr/share/doc/xv-3.10a-r13/README.bz2 /usr/share/doc/xv-3.10a-r13/README.jumbo.bz2 /usr/share/doc/xv-3.10a-r13/README.pcd.bz2 /usr/share/doc/xv-3.10a-r13/bmp.doc.bz2 /usr/share/doc/xv-3.10a-r13/epsf.ps.bz2 /usr/share/doc/xv-3.10a-r13/gif87.doc.bz2 /usr/share/doc/xv-3.10a-r13/gif89.doc.bz2 /usr/share/doc/xv-3.10a-r13/xpm.ps.bz2 /usr/share/doc/xv-3.10a-r13/xvdocs.ps.bz2 /usr/share/doc/xv-3.10a-r13/xvtitle.ps.bz2 /usr/share/man /usr/share/man/man1 /usr/share/man/man1/bggen.1.bz2 /usr/share/man/man1/vdcomp.1.bz2 /usr/share/man/man1/xcmap.1.bz2 /usr/share/man/man1/xv.1.bz2 /usr/share/man/man1/xvpictoppm.1.bz2
Good catch! The upstream patches changed the make install a little, so I have fixed the paths. Thanks for the report! Fixed in r14.