=> Bootstrap dependency digest>=20010302: found digest-20190127
===> Skipping vulnerability checks.
WARNING: No /var/db/pkg/pkg-vulnerabilities file found.
WARNING: To fix run: `/usr/sbin/pkg_admin -K /var/db/pkg fetch-pkg-vulnerabilities'.
===> Building for ocaml-ppx_optional-0.12.0
File "src/ppx_optional.ml", line 28, characters 29-33:
28 |   { e with pexp_attributes = attr :: e.pexp_attributes }
                                  ^^^^
Error: This expression has type string Ppxlib.Location.loc * Ppxlib.payload
       but an expression was expected of type
         Ppxlib.attribute = Migrate_parsetree__Ast_408.Parsetree.attribute
*** Error code 1

Stop.
make[1]: stopped in /amd/pkgsrc/CHROOT/P/pkgsrc/devel/ocaml-ppx_optional
*** Error code 1

Stop.
make: stopped in /amd/pkgsrc/CHROOT/P/pkgsrc/devel/ocaml-ppx_optional