checking for correct ltmain.sh version... no
configure: error:

*** [Gentoo] sanity check failed! ***
*** libtool.m4 and ltmain.sh have a version mismatch! ***
*** (libtool.m4 = 1.5.23b, ltmain.sh = 1.5.22) ***

Please run:

  libtoolize --copy --force

if appropriate, please contact the maintainer of this
package (or your distribution) for help.

make: *** [config.status] Error 1

!!! ERROR: x11-libs/nucleo-0.6 failed.
Call stack:
  ebuild.sh, line 1615:   Called dyn_compile
  ebuild.sh, line 972:   Called qa_call 'src_compile'
  ebuild.sh, line 44:   Called src_compile
  nucleo-0.6.ebuild, line 47:   Called die

!!! make failed
!!! If you need support, post the topmost build error, and the call stack if relevant.
!!! A complete build log is located at '/var/tmp/portage/x11-libs/nucleo-0.6/temp/build.log'.