/usr/share/libAfterImage/doc/html/index.html /usr/share/libAfterImage/doc/html/Glossary.html /usr/share/libAfterImage/doc/html/asflip.html /usr/share/libAfterImage/doc/html/asview.html /usr/share/libAfterImage/doc/html/ascmap.html /usr/share/libAfterImage/doc/html/asimagexml.html /usr/share/libAfterImage/doc/html/common.html /usr/share/libAfterImage/doc/html/astile.html /usr/share/libAfterImage/doc/html/asfont.html /usr/share/libAfterImage/doc/html/char2uni.html /usr/share/libAfterImage/doc/html/imencdec.html /usr/share/libAfterImage/doc/html/asscale.html /usr/share/libAfterImage/doc/html/asmerge.html /usr/share/libAfterImage/doc/html/transform.html /usr/share/libAfterImage/doc/html/asgrad.html /usr/share/libAfterImage/doc/html/blender.html /usr/share/libAfterImage/doc/html/ximage.html /usr/share/libAfterImage/doc/html/import.html /usr/share/libAfterImage/doc/html/afterimage.html /usr/share/libAfterImage/doc/html/asimage.html /usr/share/libAfterImage/doc/html/astext.html /usr/share/libAfterImage/doc/html/asvisual.html /usr/share/libAfterImage/doc/html/ascompose.html /usr/share/libAfterImage/doc/html/export.html I haven't tested, but setting AFTER_DOC_DIR during make install to /usr/share/doc/${PF}/html should be enough to install it in the proper location for Gentoo filesystem layout.
fixed, thanks!