The latest commit (as of this report) of onetrueawk cannot built release 2022b of the IANA tz database.

Steps to reproduce

1. Use latest commit from this repository; build awk and install in $PATH
2. Check out tag 2022b from https://github.com/eggert/tz
3. make rearguard_tarballs

Result:

awk: syntax error at source line 110 source file ziguard.awk
 context is
	      stdoff_column = 2 * >>>  / <<< ^Zone/ + 1
awk: illegal statement at source line 110 source file ziguard.awk
awk: illegal statement at source line 110 source file ziguard.awk
make: *** [main.zi] Error 2

Regression:
Works in FreeBSD 13.0 (earlier commit of onetrueawk, version 20190529)
Works with gawk among others