=> Bootstrap dependency digest>=20010302: found digest-20190127
===> Skipping vulnerability checks.
WARNING: No /usr/pkg/pkgdb/pkg-vulnerabilities file found.
WARNING: To fix run: `/usr/sbin/pkg_admin -K /usr/pkg/pkgdb fetch-pkg-vulnerabilities'.
===> Building for ocaml-digestif-0.7.2nb1
File "dune-project", line 2, characters 0-28:
2 | (using library_variants 0.1)
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Error: Extension library_variants was deleted in the 2.6 version of the dune
language
*** Error code 1

Stop.
make[1]: stopped in /tree/pkgsrc/devel/ocaml-digestif
*** Error code 1

Stop.
make: stopped in /tree/pkgsrc/devel/ocaml-digestif