>>> Emerging (7 of 18) media-gfx/gimp-2.2.12 to /
>>> checking ebuild checksums ;-)
>>> checking auxfile checksums ;-)
>>> checking miscfile checksums ;-)
>>> checking gimp-2.2.12.tar.bz2 ;-)
>>> Unpacking source...
>>> Unpacking gimp-2.2.12.tar.bz2 to /var/tmp/portage/gimp-2.2.12/work
 * Applying ltmain_sh-1.5.0-fix-relink.patch ...                          [ ok ]
>>> Source unpacked.
>>> Compiling source in /var/tmp/portage/gimp-2.2.12/work/gimp-2.2.12 ...
 * Running elibtoolize in: gimp-2.2.12
 *   Applying portage-1.5.10.patch ...
 *   Applying max_cmd_len-1.5.20.patch ...
 *   Applying sed-1.5.6.patch ...
 * econf: updating gimp-2.2.12/config.guess with /usr/share/gnuconfig/config.gue
ss
 * econf: updating gimp-2.2.12/config.sub with /usr/share/gnuconfig/config.sub
/usr/bin/confcache --confcache-ignore /var/tmp/.distcc --confcache-dir /var/tmp/
confcache ./configure --prefix=/usr --host=powerpc-unknown-linux-gnu --mandir=/u
sr/share/man --infodir=/usr/share/info --datadir=/usr/share --sysconfdir=/etc --
localstatedir=/var/lib --disable-default-binary --with-x  --enable-altivec --dis
able-gtk-doc --enable-python --disable-print --with-libpng --with-libjpeg --with
-libexif --disable-mp --without-libtiff --without-libmng --without-aa --without-
lcms --without-gtkhtml2 --without-librsvg --disable-debug --build=powerpc-unknow
n-linux-gnu
configure: WARNING: you should use --build, --host, --target
configure: loading cache config.cache
configure: error: `target_alias' was not set in the previous run
configure: error: changes in the environment can compromise the build
configure: error: run `make distclean' and/or `rm config.cache' and start over

!!! Please attach the following file when filing a report to bugs.gentoo.org:
!!! /var/tmp/portage/gimp-2.2.12/work/gimp-2.2.12/config.log

!!! ERROR: media-gfx/gimp-2.2.12 failed.
Call stack:
  ebuild.sh, line 1539:   Called dyn_compile
  ebuild.sh, line 939:   Called src_compile
  gimp-2.2.12.ebuild, line 108:   Called econf '--disable-default-binary' '--wit
h-x' '' '--enable-altivec' '--disable-gtk-doc' '--enable-python' '--disable-prin
t' '--with-libpng' '--with-libjpeg' '--with-libexif' '--disable-mp' '--without-l
ibtiff' '--without-libmng' '--without-aa' '--without-lcms' '--without-gtkhtml2' 
'--without-librsvg' '--disable-debug'
  ebuild.sh, line 541:   Called die

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