chg-zd-mtx is missing a line for the configured prefix.  It has a line
for @exec_prefix@, but if that wasn't specified during configure, it
defaults to @prefix@.  This results in the following block after
`make`.

   # source utility functions and values from configure
   exec_prefix=${prefix}
   libexecdir=${exec_prefix}/libexec
   . ${libexecdir}/chg-lib.sh

In this case, the script would look for chg-lib.sh in
/libexec/chg-lib.sh, which is incorrect.

Patch is attached.

amanda-2.5.2p1-chg-zd-mtx_prefix.diff
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