Attempting to install to MacBook...I got the following error ->
Macintosh-2:~ bradbrewer$ /Applications/Splunk/bin/splunk start
Splunk> Australian for grep.
Checking http port : open
Checking mgmt port : open
Checking appserver port [127.0.0.1:8065]: open
Checking kvstore port : open
Checking configuration... Done.
Checking critical directories... Done
homePath='/Applications/Splunk/var/lib/splunk/audit/db' of index=audit on unusable filesystem.
Validating databases (splunkd validatedb) failed with code '1'. If you cannot resolve the issue(s) above after consulting documentation, please **file a case online at http://www.splunk.com/page/submitissuestrong text**
Glad to hear it. Please accept the answer below to mark this question as closed, and you may also want to upvote the original solution, considering it contained the actual solution.
You cannot downvote posts just because there is no answer available. You can only downvote a post if the information is misleading or harmful to your Splunk instance and you can refer to Splunk Answers guidelines for more information. We try to promote healthy discussions here since the Community Splunk Experts are trying to help people with their best. Having said that, there is an answer to this post which is posted below by @micahkemp. If that answer did not work please post a new question.
This does seem to be specific to MacOS - and here is the fix:
You'll want to append the following configuration option to $SPLUNK_HOME/etc/splunk-launch.conf:
OPTIMISTICABOUTFILE_LOCKING = 1