Not the end of the world if this isn't wanted; it's needed on Fedora 19, and (I think) Fedora 20 which some of my old test hosts are still running and I was tired of patching around it locally. Seems like a mostly harmless compatibility boost.

utACK

Concept ACK

Though what I think is interesting here is that we have a severity argument, just not the definition of EVENT_LOG_WARN. Looking at the changelog the old (now deprecated) name for EVENT_LOG_WARN was prefixed with an underscore. Can you try:

#ifndef EVENT_LOG_WARN
#define EVENT_LOG_WARN _EVENT_LOG_WARN
#endif

BTW: If you plan on doing any benchmarking or advanced testing, please use an up to date libevent. There have been various nasty bugs fixed over time.

Indeed, _EVENT_LOG_WARN is there and has the same definition.