* Attempting to build documentation
make -C doc doc
make[1]: Entering directory `/var/tmp/portage/media-libs/libdvbpsi-0.1.5/work/libdvbpsi4-0.1.5/doc'
dot -Tpng -o decoder.png decoder.dot
Renderer type: "png" not recognized. Use one of: canon cmap cmapx dia dot fig gd gd2 gif hpgl imap ismap mif mp pcl pic plain plain-ext ps ps2 svg svgz vtx wbmp xdot
make[1]: *** [decoder.png] Error 1
make[1]: Leaving directory `/var/tmp/portage/media-libs/libdvbpsi-0.1.5/work/libdvbpsi4-0.1.5/doc'
make: *** [doc] Error 2