Compiling table_log for PG 11 / attisdropped

Hi. I'm trying to update some databases from 9.6 to 11, and they use
table_log for tracking changes to tables.

I started with the most recent version I could find, a fork labeled version
0.5. [1]

This version compiles on both 9.6, and 10, but on 11 it fails with these
errors:

table_log.c: In function ‘count_columns’:
table_log.c:80:27: error: invalid type argument of ‘->’ (have
‘FormData_pg_attribute’)
if (!tupleDesc->attrs[i]->attisdropped)
^
table_log.c: In function ‘__table_log’:
table_log.c:339:56: error: invalid type argument of ‘->’ (have
‘FormData_pg_attribute’)
if (trigdata->tg_relation->rd_att->attrs[col_nr - 1]->attisdropped)
^
table_log.c:373:56: error: invalid type argument of ‘->’ (have
‘FormData_pg_attribute’)
if (trigdata->tg_relation->rd_att->attrs[col_nr - 1]->attisdropped)

Can anyone shed any light on these errors, and/or how they might be fixed?

(I did try filing an issue with this project [2], but since there is no
activity there I'm turning to this mailing list.)
(Also, I know table_log is quite old and there are better alternatives. If
I were starting fresh I would surely use them. But it works for my simple
needs, and I have a lot of legacy data accumulated, so I would really like
to avoid switching to a new or different logging system.)

Thanks in advance,
Ken

[1] Table log: https://github.com/psoo/table_log
[2] Issue filed: https://github.com/psoo/table_log/issues/2
[3] table_log.c: https://github.com/psoo/table_log/blob/master/table_log.c

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