illegal instruction - create compile variants ?

Hi, a user of rakarrack was getting startup exception SIGILL [1]. Seems the config/make/compile process for this app checks CPU capability of the machine it is being compiled on, and applies optimisations that are available on that processor. The user has a much older processor. Upstream suggest [2] that distros could add a script to detect runtime CPU, and call the appropriately compiled executable. To do that in rpm, I think I would need to call configure a second time. Also, the new compile would overwrite the first compile, so it doesn't seem that easy. Any suggestions on a way forward ? [1] https://bugzilla.redhat.com/show_bug.cgi?id=700183 [2] http://rakarrack.sourceforge.net/FAQ.html [Why when I run rakarrack I receive a "Illegal Instruction" message?]