Fix 'make distcheck' (homebrew acceptance test)

Change-Id: Ie61efb963f30a4548c97dfe63e261db36c2b66e2
Reviewed-on: http://review.couchbase.org/27533
Tested-by: Sergey Avseyev <sergey.avseyev@gmail.com>
Reviewed-by: Trond Norbye <trond.norbye@gmail.com>