Problem compiling GUI on Gentoo Linux

Daniel Tourde - Caelae.se wrote:
Hello,

I have a problem building GUI on Gentoo Linux.

./build_configure works:
Updating 'configure.in' file ... done
Updating 'configure' script ...  done

However, ./configure gives me:
checking for correct ltmain.sh version... no
configure: error:

*** [Gentoo] sanity check failed! ***
*** libtool.m4 and ltmain.sh have a version mismatch! ***
*** (libtool.m4 = 1.5.22, ltmain.sh = 1.5.6) ***

Please run:

  libtoolize --copy --force

and 'libtoolize --copy --force' gives me:
libtoolize: cannot handle variables in AC_CONFIG_AUX_DIR


How am I supposed to solve that?

Daniel