MacOS X doesn't have TCP_KEEPIDLE/TCP_KEEPINTVL but only a single TCP_KEEPALIVE (see http://developer.apple.com/library/mac/#DOCUMENTATION/Darwin/Reference/ManPages/man4/tcp.4.html).
Here is a patch for CURLOPT_TCP_KEEPIDLE on OSX platforms.
Many thanks, merged and pushed just now as commit 29fdb2700f7979e71b8. Closing this!
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