Hola
al hacer energes me tira estos errores:

localhost ~ # emerge xsane
Calculating dependencies... done!
>>> Emerging (1 of 3) sys-libs/libieee1284-0.2.1 to /
>>> checking ebuild checksums ;-)
>>> checking auxfile checksums ;-)
>>> checking miscfile checksums ;-)
>>> checking libieee1284-0.2.1.tar.bz2 ;-)
>>> Unpacking source...
>>> Unpacking libieee1284-0.2.1.tar.bz2 to /var/tmp/portage/libieee1284-0.2.1/work
>>> Source unpacked.
>>> Compiling source in /var/tmp/portage/libieee1284-0.2.1/work/libieee1284-0.2.1 ...
* Running elibtoolize in: libieee1284-0.2.1
* Applying portage-1.5.10.patch ...
* Applying sed-1.5.6.patch ...
* Applying uclibc-conf-1.2.0.patch ...
* econf: updating libieee1284-0.2.1/config.guess with /usr/share/gnuconfig/config.guess
* econf: updating libieee1284-0.2.1/config.sub with /usr/share/gnuconfig/config.sub
./configure --prefix=/usr --host=i686-pc-linux-gnu-3.4.4 --mandir=/usr/share/man --infodir=/usr/share/info --datadir=/usr/share --sysconfdir=/etc --localstatedir=/var/lib --build=i686-pc-linux-gnu-3.4.4
checking for a BSD-compatible install... /bin/install -c
checking whether build environment is sane... yes
checking for gawk... gawk
checking whether make sets ${MAKE}... yes
checking for i686-pc-linux-gnu-3.4.4-gcc... no
checking for gcc... gcc
checking for C compiler default output... a.out
checking whether the C compiler works... yes
checking whether we are cross compiling... no
checking for suffix of executables...
checking for suffix of object files... o
checking whether we are using the GNU C compiler... yes
checking whether gcc accepts -g... yes
checking for style of include used by make... GNU
checking dependency style of gcc... gcc3
checking whether gcc and cc understand -c and -o together... yes
checking how to run the C preprocessor... gcc -E
checking for a BSD-compatible install... /bin/install -c
checking whether ln -s works... yes
checking whether make sets ${MAKE}... (cached) yes
checking build system type... Invalid configuration `i686-pc-linux-gnu-3.4.4': machine `i686-pc-linux-gnu' not recognized
configure: error: /bin/sh ./config.sub i686-pc-linux-gnu-3.4.4 failed

!!! Please attach the following file when filing a report to bugs.gentoo.org:
!!! /var/tmp/portage/libieee1284-0.2.1/work/libieee1284-0.2.1/config.log

!!! ERROR: sys-libs/libieee1284-0.2.1 failed.
Call stack:
ebuild.sh, line 1539: Called dyn_compile
ebuild.sh, line 939: Called src_compile
libieee1284-0.2.1.ebuild, line 24: Called econf
ebuild.sh, line 541: Called die

!!! econf failed
!!! If you need support, post the topmost build error, and the call stack if relevant.

------------------------------------------------------------------------------
Como puedo darle solucion?

gracias

hace un emerge --info y pasame la data que te tira... parece que tenes mal configurado el make.conf

oks cualquier duda contactate con nosotros. Además te paso un plus: http://gentoo-wiki.com/Safe_Cflags para que optimizes aún más tu máquina, fijate el tipo y modelo de procesador que tenes y agregá las CFLAGS correspondientes...

Salu2...

Hola

localhost ~ # emerge --info
Portage 2.1-r1 (default-linux/x86/2006.0, gcc-3.4.4, glibc-2.3.5-r2, 2.6.15-gentoo-r5 i686)
=================================================================
System uname: 2.6.15-gentoo-r5 i686 AMD Athlon™ XP 2000+
Gentoo Base System version 1.6.14
dev-lang/python: 2.4.3-r1
dev-python/pycrypto: 2.0.1-r5
dev-util/ccache: [Not Present]
dev-util/confcache: [Not Present]
sys-apps/sandbox: 1.2.17
sys-devel/autoconf: 2.13, 2.59-r6
sys-devel/automake: 1.4_p6, 1.5, 1.6.3, 1.7.9-r1, 1.8.5-r3, 1.9.6-r1
sys-devel/binutils: 2.16.1
sys-devel/gcc-config: 1.3.12-r6
sys-devel/libtool: 1.5.22
virtual/os-headers: 2.6.11-r2
ACCEPT_KEYWORDS="x86"
AUTOCLEAN="yes"
CBUILD="i686-pc-linux-gnu-3.4.4"
CFLAGS="-march=athlon-xp -O2 -pipe"
CHOST="i686-pc-linux-gnu-3.4.4"
CONFIG_PROTECT="/etc /usr/kde/3.4/env /usr/kde/3.4/share/config /usr/kde/3.4/shutdown /usr/lib/X11/xkb /usr/lib/mozilla/defaults/pref /usr/share/config"
CONFIG_PROTECT_MASK="/etc/env.d /etc/gconf /etc/terminfo"
CXXFLAGS="-march=athlon-xp -O2 -pipe"
DISTDIR="/usr/portage/distfiles"
FEATURES="autoconfig distlocks metadata-transfer sandbox sfperms strict"
GENTOO_MIRRORS="http://distfiles.gentoo.org http://distro.ibiblio.org/pub/linux/dist...ons/gentoo"
LANG="es_ES.UTF-8"
MAKEOPTS=""
PKGDIR="/usr/portage/packages"
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"
SYNC="rsync://rsync.gentoo.org/gentoo-portage"
USE="X alsa apache2 apm arts audiofile avi berkdb bitmap-fonts bzip2 cdr cli crypt ctype cups dba dlloader dri eds elibc_glibc emboss encode esd ethereal exif expat fam fastbuild foomaticdb force-cgi-redirect fortran ftp gd gdbm gif glut gmp gnome gpm gstreamer gtk gtk2 gtkhtml guile idn imlib ipv6 isdnlog jpeg kde kernel_linux lcms libg++ libwww mad memlimit mikmod mng motif mozilla mp3 mpeg ncurses nls nptl ogg opengl oss pam pcre pdflib perl png posix pppd python qt qt3 qt4 quicktime readline reflection samba sdl session simplexml slang soap sockets spell spl ssl tcltk tcpd tiff tokenizer truetype truetype-fonts type1-fonts udev userland_GNU vorbis x86 xml xml2 xmms xorg xsl xv zlib input_devices_keyboard input_devices_mouse input_devices_evdev"
Unset: CTARGET, EMERGE_DEFAULT_OPTS, INSTALL_MASK, LC_ALL, LDFLAGS, LINGUAS, PORTAGE_RSYNC_EXTRA_OPTS, PORTDIR_OVERLAY
-----------------------------------------------------------------------------------------------

Cambia en /etc/make.conf lo siguiente:

CHOST="i686-pc-linux-gnu-3.4.4" por CHOST="i686-pc-linux-gnu"

CFLAGS="-march=athlon-xp -O2 -pipe" por CFLAGS="-march=athlon-xp -O2 -pipe -fomit-frame-pointer"

CXXFLAGS="-march=athlon-xp -O2 -pipe" por CXXFLAGS="${CFLAGS}"

Salu2...

igualmente el problema radicaba en CHOST="i686-pc-linux-gnu-3.4.4" que lo especificaste mal, igualmente te pase la solución y además la optimización. Acordate que las CFLAGS y CHOST entre otras banderas determinan el funcionar de gcc en base a tu procesador...
También fijate después de analizar los parametros que pusiste en USE, ya que hay varios que capaz no necesites...

Salu2... y cualquier problema que se te presente postealo...

Solucionado !!!!
Mil gracias