Point Coq to Why3 realizations by adding a -R option inside its prover commands.
My first idea was to use "-R @libdir@/coq", or some other variable I would have defined in configure.in, but it didn't work at all. Indeed, such path variables depend on cascaded substitution, which work fine inside make files and shell scripts, but not at all inside Why3 config files. Note that this is a documented feature of Autoconf so I doubt there is any way to circumvent it. So I ended up adding a new format specifier inside call_provers: %l is substituted by Config.libdir.
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