Github user anmolnar commented on the issue:
https://github.com/apache/zookeeper/pull/528
@phunt I ran a few cycles with the curl commit that you linked and here're
my results:
- there's no such thing with autotools that "check for a macro existence
and use it if present", because macros must always be extracted even if they
behind an if condition,
- Curl circumvents this behaviour by directly calling commands like
`pkg-config --libs MYLIB` instead of using the macro that package maintainer
provides,
- as a consequence we either can use the old AM_PATH_CPPUNIT macro or the
new pkg-config macro, but not both.
I'm not a fan of Curl approach: it runs custom code essentially which seems
to me fragile.
To make an end to this conversion I think we have 2 options.
1. Replace the old macro with the new one and commit it to trunk only -->
we stop supporting the old way from 3.6.0 and pkg-config will be required.
Reward: ZK builds on new systems like Ubuntu 18.04.
2. Don't do anything.
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