pmacct-0.8.4 is said to work with amd64. Please test and mark it ~amd64 if it works. Starting the daemon and seeing if the binary runs should be enough.
*** Bug 89083 has been marked as a duplicate of this bug. ***
Compiles and runs well here. Portage 2.0.51.19 (default-linux/amd64/2005.0, gcc-3.4.3-20050110, glibc-2.3.5-r0, 2.6.11-gentoo-r3 x86_64) ================================================================= System uname: 2.6.11-gentoo-r3 x86_64 AMD Athlon(tm) 64 Processor 3200+ Gentoo Base System version 1.6.10 Python: dev-lang/python-2.3.5 [2.3.5 (#1, Mar 29 2005, 21:24:34)] distcc 2.18.3 x86_64-pc-linux-gnu (protocols 1 and 2) (default port 3632) [disabled] ccache version 2.4 [enabled] dev-lang/python: 2.3.5 sys-devel/autoconf: 2.59-r6, 2.13 sys-devel/automake: 1.7.9-r1, 1.8.5-r3, 1.5, 1.4_p6, 1.6.3, 1.9.5 sys-devel/binutils: 2.15.92.0.2-r8 sys-devel/libtool: 1.5.14 virtual/os-headers: 2.6.8.1-r4 ACCEPT_KEYWORDS="amd64 ~amd64" AUTOCLEAN="yes" CFLAGS="-march=athlon64 -O2 -pipe -fweb -ftracer" CHOST="x86_64-pc-linux-gnu" CONFIG_PROTECT="/etc /usr/kde/2/share/config /usr/kde/3.3/env /usr/kde/3.3/share/config /usr/kde/3.3/shutdown /usr/kde/3/share/config /usr/lib/X11/xkb /usr/lib/mozilla/defaults/pref /usr/share/config /var/qmail/control" CONFIG_PROTECT_MASK="/etc/gconf /etc/terminfo /etc/texmf/web2c /etc/env.d" CXXFLAGS="-march=athlon64 -O2 -pipe -fweb -ftracer" DISTDIR="/mnt/nfs/home/portage/distfiles" FEATURES="autoaddcvs autoconfig ccache distlocks multilib-strict sandbox" GENTOO_MIRRORS="ftp://ftp.gentoo.mesh-solutions.com/gentoo/ http://ftp.snt.utwente.nl/pub/os/linux/gentoo http://www.mirrorservice.org/sites/www.ibiblio.org/gentoo/" MAKEOPTS="-j2" PKGDIR="/usr/portage/packages" PORTAGE_TMPDIR="/home/tmp" PORTDIR="/usr/portage" PORTDIR_OVERLAY="/usr/local/overlays/main /usr/local/overlays/mplayer32-bin" SYNC="rsync://trantor/gentoo-portage" USE="amd64 S3TC X a52 aac aalib acpi alsa avi berkdb bitmap-fonts cdr crypt cups curl dga divx4linux dvd dvdr dvdread eds encode escreen etwin evo faad fam fbcon ffmpeg flac flash fortran gd gdbm gif gimpprint gnome gphoto2 gpm gstreamer gtk gtk2 gtkhtml hal imagemagick imap imlib ipv6 java javascript jp2 jpeg ldap libwww lzw lzw-tiff mad maildir mikmod mjpeg motif mozaccess-builtin mozilla mozirc mozxmlterm mp3 mpeg mysql ncurses nls nptl nptlonly nvidia offensive ogg oggvorbis opengl oss pam perl plotutils png python quicktime readline samba sdl slang sox speex spell ssl svg tcpd tetex theora threads tiff truetype truetype-fonts type1-fonts unicode usb userlocales vorbis xface xine xinerama xml2 xmms xpm xrandr xv xvid xvmc zlib video_cards_nvidia" Unset: ASFLAGS, CBUILD, CTARGET, LANG, LC_ALL, LDFLAGS, LINGUAS
fixed in cvs, thanks for reporting.