BIRCH - Overriding
In some cases, two different versions of a program are installed, one
in BIRCH and one independently of BIRCH. BIRCH tries to have a minimal
impact on the system. Therefore, the search path set up by BIRCH has
directories in the following order:
... system paths...
The way to make BIRCH programs override programs that are installed
independently of BIRCH is to add symbolic links from the $local/script
to $BIRCH/script, or from $local/bin-xxx-xxx to $BIRCH/bin-xxx-xxx.
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