Here's an easy one: when emerging matplotlib: * checking matplotlib-0.87.4.tar.gz ;-) ... [ ok ] * You need to recompile python with Tkinter support. * That means: 'dev-lang/python X tcltk' * in /etc/portage/package.use But: [ebuild R ] dev-lang/python-2.4.3-r1 USE="berkdb gdbm ncurses readline ssl -bootstrap -build -doc -ipv6 -nocxx -tk -ucs2" 0 kB So the matplotlib message should be about use tk not use tcltk.
BTW, the same in python.eclass - python_tkinter_exists()
fixed in portage. thanks for the report.
*** Bug 144174 has been marked as a duplicate of this bug. ***