These ebuilds come from https://git.overlays.gentoo.org/gitweb/?p=dev/mescalinum/tcl-8.6.git;a=summary.
If you have some problems, go to the official site first.
itcl : Object Oriented Enhancements for Tcl/Tk ( http://incrtcl.sourceforge.net/ )
itk : Object Oriented Enhancements for Tcl/Tk ( http://incrtcl.sourceforge.net/ )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a tcl-8.6
For Paludis use this rsync : rsync://gentoo.zugaina.org/tcl-8.6-portage
If you have a problem : ycarus(-at-)zugaina.org