find_perl version, \names, \dirs, trace
Searches for an executable Perl. Takes the following arguments:
- version
The executable must be at least the version given by version.
- \names
Array reference. The name of the executable must be an entry in
the array.
- \dirs
Array reference. The executable must be in a directory that is one
of the entries in the array.
- trace
If trace is true, prints debugging information.