[tz] rearguard

[Paul Eggert]

Lord Buddha wrote:
> OK, works with "gawk"

Yes, the problem here is that Debian (and Ubuntu) use an ancient version of mawk 
that dumps core too often. They really should upgrade. I can reproduce the 
problem with mawk 1.3.3 (November 1996), which is the default on Ubuntu 16.04.4 
LTS. I cannot reproduce the problem with mawk 1.3.4 20171017.

I reported this problem to the Ubuntu maintainers here:

https://bugs.launchpad.net/ubuntu/+source/mawk/+bug/1782342

I assume It'll take some time for Ubuntu and/or Debian to push fixes out. In the 
meantime I installed the attached commentary patch to the tzdb makefile.

You can also work around the problem by running:

sudo update-alternatives --config awk

and choosing gawk instead of mawk.
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