Plee see http://secure.netroedge.com/~lm78/kernel26.html. Lm-sensors 2.7 is for the 2.4 line of kernels, which is deprecated. So installing a 2.7 version on a 2.6 kernel is probably not the best idea, however this is the only unmasked version atm.
Is this still an issue? The lastest lm-sensort in portage is 2.8.1
With kernel ck-sources-2.6.4-r1 My emerge --info : Portage 2.0.50-r1 (default-x86-1.4, gcc-3.3.3, glibc-2.3.3_pre20040207-r0, 2.6.4-ck1) ================================================================= System uname: 2.6.4-ck1 i686 AMD Duron(tm) Processor Gentoo Base System version 1.4.3.13p1 Autoconf: sys-devel/autoconf-2.59-r3 Automake: sys-devel/automake-1.8.3 ACCEPT_KEYWORDS="x86 ~x86" AUTOCLEAN="yes" CFLAGS="-march=athlon -m3dnow -O2 -pipe -fomit-frame-pointer -ffast-math -fno-gcse" CHOST="i686-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/lib/mozilla/defaults/pref /usr/share/config /var/qmail/control" CONFIG_PROTECT_MASK="/etc/gconf /etc/terminfo /etc/env.d" CXXFLAGS="-march=athlon -m3dnow -O2 -pipe -fomit-frame-pointer -ffast-math -fno-gcse" DISTDIR="/usr/portage/distfiles" FEATURES="autoaddcvs ccache fixpackages sandbox" GENTOO_MIRRORS="http://ftp.snt.utwente.nl/pub/os/linux/gentoo ftp://ftp.tu-clausthal.de/pub/linux/gentoo/ http://gentoo.oregonstate.edu/distfiles" 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="3dnow X alsa apm arts avi berkdb bonobo cdr crypt cups dvd dvdr encode esd foomaticdb gdbm gif gnome gpm gtk gtk2 gtkhtml guile imlib ipv6 java jpeg kde ldap libg++ libwww linguas_fr mad mikmod mmx motif mozilla moznocompose moznoirc mpeg ncurses nls nptl oggvorbis opengl oss pam pda pdflib perl png ppds python qt quicktime readline samba scanner sdl slang spell ssl svga tcltk tcpd truetype usb x86 xml2 xmms xv zlib" My /etc/portage/package.unmask : sys-apps/lm-sensors net-www/mozilla My installed lm-sensors version : Latest version installed: 2.8.5 An emerge -up --deep world : Calculating world dependencies ...done! [ebuild N ] sys-apps/i2c-2.8.1 [ebuild N ] sys-apps/lm-sensors-2.8.1 2.8.1 version of lm-sensors should not be proposed.
2.8.5 was masked in package.mask, which has been removed as of yesterday. 2.8.1 is perfectly valid for those who go against recommendation and use a 2.4 kernel on amd64.