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Predicate has_program/3
 has_program(+Spec) is semidet
 has_program(+Spec, -Path) is semidet
 has_program(+Spec, -Path, +Env:list) is semidet
True when the OS has the program Spec at the absolute file location Path. Normally called as e.g. has_program(path(cmake), CMakeExe). The second allows passing in an environment as Name=Value pairs. If this contains a value for PATH, this is used rather than the current path variable.
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