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I've done some work on providing multi-slot Tcl and Tk packages.
you can find it on my overlay [1]

this work consists basiaclly of:
1) modifying tcl/tk ebuilds for install stuff with
- --prefix=/usr/tcl/${SLOT}
 and merging all the ebuilds code into the tcltk eclass
2) provide a tcltk eselect module for switching the active tcltk version

pro:
this would allow less painful unmasking and stabilizing of tcl/tk
packages, so users can have a tcl runtime of the 21st century =))
tcltk apps that are less "vital" (i.e. have not "ported" to newer
runtimes) could still live on a system using the tcltk switcher

potential issues:
this could become troublesome if there is a tcl extension installed,
and is needed both for tcl 8.5 and tcl 8.6. it should be reinstalled
after each 'eselect tcltk set ...'


btw, on a different topic: the number of bugs on tcltk (8.5) has
lowered a bit.
maybe it's time to unmask it and have package maintainers fix the
outdated apps?


[1] http://overlays.gentoo.org/dev/mescalinum
* uninstall previous versions of tcl/tk if you are testing this, as
slotmoves are not possible for overlays
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