i'm not sure either, but that xm thing sounds like maybe a needed X header or library. (?)
what i would do is email the author.
from personal experience i've contacted him twice about xscreensaver. one was for help installing xscreensaver with the old version of xscreensaver which red hat wouldn't let me uninstall and the other for a non-important question. he got back to me almost immediately and was most helpful. but, although he distibutes everything in source, for red hat anyway, you can build rpms out of the source using 'rpm -ta *.gz', which is what i've been doing lately and forcing the install of the newer version. i don't know how different mandy's version of rpm is though. but i would fire off an email to him.