emerge sci-geosciences/grass fails in configure phase.

mypc % eix dev-lang/tcl
[I] dev-lang/tcl
Available versions: 8.6.2(0/8.6)

Unknown macro: {debug +threads ABI_MIPS="n32 n64 o32" ABI_PPC="32 64" ABI_S390="32 64" ABI_X86="32 64 x32"}

Installed versions: 8.6.2(07:46:02 03/11/2014)(threads -debug ABI_MIPS="-n32 -n64 -o32" ABI_PPC="-32 -64" ABI_S390="-32 -64" ABI_X86="64 -32 -x32")
Homepage: http://www.tcl.tk/
Description: Tool Command Language

mypc % eix dev-lang/tk
[I] dev-lang/tk
Available versions: 8.6.2(0/8.6)

Unknown macro: {aqua debug test +threads truetype xscreensaver}

Installed versions: 8.6.2(16:38:23 08/11/2014)(threads truetype xscreensaver -aqua -debug -test)
Homepage: http://www.tcl.tk/
Description: Tk Widget Set