Checking for an include file that requires another include file

[Richard Sharpe]

Hi,

I am working on the Zookeeper registry backend and want to check for
the existence of a Zookeeper include file, zookeeper_log.h, that
requires zookeeper itself.

This requires that -I/usr/local/include/zookeper be passed to CHECK_HEADERS.

How do I do that?

-- 
Regards,
Richard Sharpe
(何以解憂？唯有杜康。--曹操)