cpufrequtils compiles and runs without problems on my powerbook. It's just a thin wrapper for /sys, so it should work on amd64 too, but I'll leave that up to you.
Thanks for the report, fixed in CVS.
Sorry about the bugspam, but I forgot that this was assigned to AMD64 as well.
Well, they build, but I can't seem to get cpufreq to work on my processor, no matter what I have in the kernel, so I can't comment on how well they work.
sys-power/cpufrequtils-0.2 emerge and run as expected here. Portage 2.0.51.19 (default-linux/amd64/2005.0, gcc-3.4.3-20050110, glibc-2.3.4.20050125-r1, 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/" LANG="en_GB.utf8" LC_ALL="en_GB.utf8" MAKEOPTS="-j2" PKGDIR="/usr/portage/packages" PORTAGE_TMPDIR="/home/portage/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 oggvorbis opengl oss pam perl plotutils png python quicktime readline samba sdl slang sox speex spell ssl svg tcpd tetex theora tiff truetype truetype-fonts type1-fonts unicode usb userlocales xface xine xinerama xml2 xmms xpm xrandr xv xvid xvmc zlib video_cards_nvidia" Unset: ASFLAGS, CBUILD, CTARGET, LDFLAGS
Keyworded, thanks Herb!