Like makefile, we can define custom variables.
But I didn’t find out how to do so in dune file.
Does anyone know whether dune support this?
Dune rules can depend on environment variables.
(env_var <var>)depends on the value of the environment variable<var>. If this variable becomes set, becomes unset, or changes value, the target will be rebuilt.
https://dune.readthedocs.io/en/stable/concepts/dependency-spec.html
It doesn’t cover all cases but maybe that’s enough for you.
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The short answer is “no”. However, you can often replace variables with files generated with (rule).
Cheers,
Nicolas
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Thanks for your help.