[tz] tzdb-2018b does not work after make clean

Paul Eggert eggert at cs.ucla.edu
Mon Jan 22 02:12:59 UTC 2018

大山俊成 wrote:
> I realized tzdata.zi was not correct( it contained just 2 comment lines).
> So, I upgraded awk that generate tzdata.zi ( mawk 1.3.3 -> gawk 4.0.1).

Thanks for the info; it helped me reproduce the portability problem, which is 
that mawk 1.3.3 does not support regular expressions like [[:alpha:]], even 
though POSIX requires support. The workaround is simple and straightforward, so 
I installed the attached patch into the development version, and it should 
appear in the next tzdb release.
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