Possible arguments: build,
      env, lib,
      run
Handle dependency on Samba.
      env will not add any dependency and only set
      up the variables.  build and
      run will add build-time and run-time
      dependency on smbd.  lib
      will add a dependency on libsmbclient.so.
      The variables that are exported are:
SAMBAPORTThe origin of the default Samba port.
SAMBAINCLUDESThe location of the Samba header files.
SAMBALIBSThe directory where the Samba shared libraries are available.
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    sent to <freebsd-questions@FreeBSD.org>.
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