#1128 pkg_mkIndex libtk.so requires DISPLAY

[Don Porter]

To be able to create a package index for Tk as
a loadable package using [pkg_mkIndex], one
must be able to load Tk. That, in turn,
requires an X DISPLAY on Unix.

This means one cannot create an index during
an install of Tk as a loadable package in the
conventional way on a headless box -- common
installation practice on Unix.

[Jeffrey Hobbs]

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I personally think that the requirement for installing Tk
(a UI toolkit) to need a display is logical, and one that
we don't want to work around. The obvious work-around is
to create a working pkgIndex.tcl for the install case,
which may be the sensical things to do anyway.

[Don Porter]

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This is less important now, since Tk comes with
a pkgIndex.tcl file.

[Andreas Kupries]

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This issue still affects any package dependent on Tk and
trying to use [pkg_mkIndex] to create their index file.

I concede that this is the minority, i.e. most packages come
with a manually crafted "pkgIndex.tcl". An exception is
TkHTML which does use [pkg_mkIndex].