I have installed new libmpcdec (SV8 complinant, from svn trunk) using this ebuild: http://code.google.com/p/4nykey/source/browse/portage/media-libs/libmpcdec/libmpcdec-9999-r1.ebuild and tried to rebuild xine. Everything else (mplayer, vlc, mpd) rebuilt fine, but xine failed finding musepack decoder: checking for LIBMAD... yes checking mad.h usability... yes checking mad.h presence... yes checking for mad.h... yes checking for mpc_decoder_decode in -lmpcdec... no checking mpcdec/mpcdec.h usability... no checking mpcdec/mpcdec.h presence... no checking for mpcdec/mpcdec.h... no configure: error: Unable to find mpcdec Reproducible: Always
Given that the ebuild does not come from anywhere near an official Gentoo repository, this is not a Gentoo issue. Please rather report this upstream to http://bugs.xine-project.org/ .