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Assigned to me, since Paul has asked me about this and I
don't want to keep that mail in my inbox forever.

Paul, please tell me exactly what you're seeing:  what
permissions are set on the file in the source directory,
what's the umask you're using, and what are the final
permissions of the installed file.  The only thing that the
install_scripts command appears to be doing is ensuring that
the executable bit is set.

Is the "group-sticky" bit set in the destination directory?
 How do the identities of the installer relate to the
owner/group of the destination directory?