update-opam-file

#!/bin/bash
set -e -u -o pipefail
output=$(dune describe external-lib-deps | sexp select external_deps | sexp query 'each (index 0)' | cut -d . -f 1 | sort -u | grep -xv dynlink | xargs echo)
sed -i -e "s/^\( *\).*MARKER/\1$output ;; MARKER/" dune-project