Github user phunt commented on the issue:
https://github.com/apache/zookeeper/pull/528
Hm. It's not very clear that
> ./configure: line 5034: PKG_PROG_PKG_CONFIG: command not found
means that pkg-config needs to be installed. Esp given we've never needed
it - it's a new dependency.
Here's an example of some pushback in the curl community
https://github.com/curl/curl/issues/972
If you do want to add this you probably need to add something like:
```
m4_ifndef([PKG_PROG_PKG_CONFIG],
[m4_fatal([Could not locate the pkg-config autoconf macros.
Please make sure pkg-config is installed and, if necessary, set the
environment
variable ACLOCAL="aclocal -I/path/to/pkg.m4".])])
```
although I'm honestly not very psyched about this change. It's going to
break a bunch of folk's builds.
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