I just found out the hard way that gmp, when compiled on my G5, is
incompatible with my G4 ppc, and it is linked to guile, which is
linked to coot, which has a scheme script called tips-gui.scm that has
a random number generator that fails if this happens, and coot will
not start up.
So if you have encountered this problem, either make an empty tips-
gui.scm file and live without the annoying tips, or else recompile gmp
(a good idea).
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