|Subject:||clean build dir and log before each build|
I tried to install several perls, first with no threads, then with threads. The building of the threaded perls failed with an undefined symbol error because the previous build of the non-threaded perl hadn't been cleaned first. Also it was not apparent at first that the log file wasn't being overwritten and that I had to search for the start of the build for each new perl. Perhaps old log files can be renamed with a timestamp extension.