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0e1f616
(Get the code!)
It does not give an error. It just does not generate the required output. In the zddevlist.awk script, a series of calls to "match" must succeed or the script generates a #error line for the compiler to find later.
Looking more closely, the problem is simply that mawk does not accept POSIX-style character classes like [:alnum:] in calls to match. I could not find any flag or environment variable that causes mawk to take POSIX character classes. gawk does so by default and thus works.
The script can be re-written to avoid POSIX-style character classes but at the expense of portability to systems with non-contiguous alphabetic character sets and/or locale-specific alphabetic characters (attached -- though this does not seem like the correct solution).