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Dune 2 only promotes the
.install
if the-p
is specified, which doesn't work for opam's build system. This commit detects whether the--promote-install-files
argument is available which isn't particularly pretty, but does mean that opam will build with both Dune 1.x and 2.x.Ultimately, it would be better to push for Dune features which eliminate the need for the post processing of the
.install
files completely and then just depend on Dune 2.0.Addresses #3961