You may add ~amd64 keyword to media-libs/libmpeg2/libmpeg2-0.3.2_pre20030625.ebuild. It compiles and runs fine for me. Reproducible: Always Steps to Reproduce: Portage 2.0.50-r1 (default-amd64-2004.0, gcc-3.3.3, glibc-2.3.3_pre20040207-r0, 2.6.3-gentoo-r1) ================================================================= System uname: 2.6.3-gentoo-r1 x86_64 4 Gentoo Base System version 1.4.3.13 Autoconf: sys-devel/autoconf-2.59-r3 Automake: sys-devel/automake-1.8.2 ACCEPT_KEYWORDS="amd64 ~amd64" AUTOCLEAN="yes" CFLAGS="-pipe -O2" CHOST="x86_64-pc-linux-gnu" COMPILER="gcc3" CONFIG_PROTECT="/etc /usr/X11R6/lib/X11/xkb /usr/kde/2/share/config /usr/kde/3.2/share/config /usr/kde/3/share/config /usr/share/config /var/qmail/control" CONFIG_PROTECT_MASK="/etc/gconf /etc/env.d" CXXFLAGS="-pipe -O2" DISTDIR="/usr/portage/distfiles" FEATURES="autoaddcvs ccache sandbox" GENTOO_MIRRORS="ftp://sunsite.informatik.rwth-aachen.de/pub/Linux/gentoo ftp://ftp.tu-clausthal.de/pub/linux/gentoo" MAKEOPTS="-j2" PKGDIR="/usr/portage/packages" PORTAGE_TMPDIR="/var/tmp" PORTDIR="/usr/portage" PORTDIR_OVERLAY="/usr/local/portage" SYNC="rsync://rsync.europe.gentoo.org/gentoo-portage" USE="X aalib alsa amd64 avi cdr dga esd foomaticdb gdbm gif gnome gtk gtk2 imlib jpeg kde libg++ libwww motif mozilla mpeg ncurses nls oggvorbis opengl oss pam pdflib perl png python qt readline sdl slang spell ssl tcltk tcpd truetype xml2 xv zlib"
done
