I can't install 64-bit and 32-bit libevent-devel at the same time, because of conflicts in event-config.h This autogenerated file contains idiotic crap like: /* The size of `long', as computed by sizeof. */ #define _EVENT_SIZEOF_LONG 4 If you remove things like that and just use sizeof() as $DEITY intended, then the files will probably end up identical, and the conflict can be resolved. (I think you may have to make the timestamps match too?) Failing that, perhaps you could call them libevent-config-32.h and libeven-config-64.h, and provide a libevent-config.h which includes one or the other as appropriate.
*** This bug has been marked as a duplicate of bug 477685 ***