net-mail/randomsig doesn't have a amd64 or ~amd64 keyword. It's a perl script, so there's no problem adding one of those. Just installed and workes fine here
emerges fine, passes collision-test and test suite, works Portage 2.1-r2 (default-linux/amd64/2006.1/desktop, gcc-4.1.1, glibc-2.4-r3, 2.6.17-gentoo-r7 x86_64) ================================================================= System uname: 2.6.17-gentoo-r7 x86_64 AMD Athlon(tm) 64 Processor 3000+ Gentoo Base System version 1.12.4 ccache version 2.3 [enabled] app-admin/eselect-compiler: [Not Present] dev-lang/python: 2.4.3-r1 dev-python/pycrypto: 2.0.1-r5 dev-util/ccache: 2.3 dev-util/confcache: [Not Present] sys-apps/sandbox: 1.2.17 sys-devel/autoconf: 2.13, 2.59-r7 sys-devel/automake: 1.4_p6, 1.5, 1.6.3, 1.7.9-r1, 1.8.5-r3, 1.9.6-r2 sys-devel/binutils: 2.16.1-r3 sys-devel/gcc-config: 1.3.13-r3 sys-devel/libtool: 1.5.22 virtual/os-headers: 2.6.11-r2 ACCEPT_KEYWORDS="amd64" AUTOCLEAN="yes" CBUILD="x86_64-pc-linux-gnu" CFLAGS="-march=k8 -O2 -pipe" CHOST="x86_64-pc-linux-gnu" CONFIG_PROTECT="/etc /usr/share/X11/xkb" CONFIG_PROTECT_MASK="/etc/env.d /etc/env.d/java/ /etc/gconf /etc/java-config/vms/ /etc/revdep-rebuild /etc/terminfo" CXXFLAGS="-march=k8 -O2 -pipe" DISTDIR="/usr/portage/distfiles" FEATURES="autoconfig ccache collision-test distlocks metadata-transfer multilib-strict parallel-fetch sandbox sfperms strict test" GENTOO_MIRRORS="ftp://sunsite.informatik.rwth-aachen.de/pub/Linux/gentoo ftp://linux.rz.ruhr-uni-bochum.de/gentoo-mirror/ ftp://ftp.uni-erlangen.de/pub/mirrors/gentoo ftp://ftp.join.uni-muenster.de/pub/linux/distributions/gentoo ftp://ftp.wh2.tu-dresden.de/pub/mirrors/gentoo ftp://ftp.join.uni-muenster.de/pub/linux/distributions/gentoo ftp://ftp-stud.fht-esslingen.de/pub/Mirrors/gentoo/ ftp://ftp.gentoo.mesh-solutions.com/gentoo/ ftp://pandemonium.tiscali.de/pub/gentoo/ " LANG="en_US.ISO8859-1" LC_ALL="en_US.ISO8859-1" MAKEOPTS="-j3" PKGDIR="/usr/portage/packages" PORTAGE_RSYNC_EXTRA_OPTS="--exclude-from=/etc/portage/rsync_excludes" PORTAGE_RSYNC_OPTS="--recursive --links --safe-links --perms --times --compress --force --whole-file --delete --delete-after --stats --timeout=180 --exclude='/distfiles' --exclude='/local' --exclude='/packages'" PORTAGE_TMPDIR="/var/tmp" PORTDIR="/usr/portage" PORTDIR_OVERLAY="/usr/local/portage/overlay" SYNC="rsync://rsync.europe.gentoo.org/gentoo-portage" USE="amd64 X a52 aac acpi alsa asf avi berkdb bitmap-fonts bzip2 cairo cdda cddb cdinstall cdr cli crypt cups dbus dlloader dri dvd dvdr emboss encode expat fam firefox fortran gdbm gif glut gpm gstreamer gtk gtk2 hal imagemagick isdnlog jpeg lcms ldap libg++ lirc mad mikmod mng mp3 mpeg musicbrainz ncurses nls nptl nptlonly ogg opengl pam pcre pdflib php png ppds pppd quicktime readline reflection sdl session socks5 spl ssl svg tcpd tiff truetype truetype-fonts type1-fonts udev unicode v4l v4l2 vorbis xine xinerama xml xorg xv zlib elibc_glibc input_devices_evdev input_devices_keyboard input_devices_mouse kernel_linux lirc_devices_hauppauge userland_GNU video_cards_fglrx video_cards_radeon" Unset: CTARGET, EMERGE_DEFAULT_OPTS, INSTALL_MASK, LDFLAGS, LINGUAS
Marked ~amd64