Here's a heads-up regarding Tcl/Tk 8.6.9:
The current (release) version of Tk is 8.6.9.1 .  But Tcl is still 8.6.9, and the BuildRequires (and Requires)
assume the versons are identical, using automagic %version and/or %vers macros.
Rather than fiddle with those, I just did this to the spec file:

Added:
  %define source_minorver .1

And hacked that into Source0:
  Source0: http://download.sourceforge.net/sourceforge/tcl/%{name}%{version}%{?source_minorver}-src.tar.gz

One other thing:  The context of tk-8.6.7-conf.patch has to be tweaked slightly.  It's pretty obvious, but
  I'll include an attachment containing the regenerated patch.

Created attachment 1613088 [details]
tk-8.6.9-conf.patch

Regenerated from original tk-8.6.7-conf.patch from tk-8.6.8-1.fc30.src.rpm

Two things I should have mentioned this before:

The top-level dir in the Tk 8.6.9.1 tarball is still "8.6.9" (without the .1), so that's
  what rpmbuild wants to see everywhere (except the %Source0 filename).

The upstream change from Tk 8.6.9 to 8.6.9.1 is just two lines affecting Mac only.

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