Bug#1010411: gucharmap installing without required version of libc6 (was: gucharmap displaying characters white on white)

[Ray Dillinger]

package: gucharmap
version:1:14.0.3

While preparing this bug report for the white-on-white characters, I
checked the versions of everything gucharmap depends on and I think I
found a packaging error.  Gucharmap wants libc6 version 2.4, but
installed without complaint even though I have libc6 version 2.33.

Packages gucharmap depends on:
libgucharmap  (I have 2.90-7)
dconf-settings-backend  |  gsettings-backend
   (I have dconf-gsettings-backend 0.40.0-3)
libatk1.0-0 (I have 1.0-0)
      ====>   libc6  2.4 (!!!  I have 2.33-7 !!! ) <=====
libcairo2 (I have 1.16.0-5 )
libglib2.0-0 (I have 2.72.1-1 )
libgtk-3.0 (I have 3.24.33-1 )
libpango-1.1-0 (I have 1.50.6+ds-2 )
libpangocairo-1.0.0 (I have 1.50.6+ds-2 )

When I open gucharmap on my desktop machine, all characters are
displayed as empty white boxes.

If I select a character, the white background darkens and the white
character is visible.

When I use a different font, the white characters displayed in their
white boxes are rendered in the new font. 

I searched a lot of resources and read a lot of documentation and tried
a lot of things without success, but if this is actually just a
packaging bug that's all irrelevant.

I did a complete uninstall, then reinstalled, and I still have libc6
2.33, and gucharmap still lists libc6 2.4 as a requirement, and apt-get
and dpkg did not even question it.

And of course I still have gucharmap displaying all characters white on
white.  For now I'm blaming the packaging error, in sincere hopes that
fixing the packaging error fixes it.

Bear