From McStas version 2.3, MCPL plugins are shipped as part of the McStas
Component distribution. Please refer to the following McStas instrument files in
the examples/ directory of that distribution for demonstrations of how to enable
the relevant components:

  examples/Test_MCPL_input.instr
  examples/Test_MCPL_output.instr

Additionally, users of McStas automatically have access to the mcpltool
command.

Further instructions are also available at https://mctools.github.io/mcpl/.
