Accept openbabel-2.0 or openbabel-3

Author: jmid

packages/conf-openbabel/conf-openbabel.0.1/opam

@@ -4,7 +4,7 @@ homepage: "http://openbabel.org/"
 license: "GPL-1.0-or-later"
 authors: "http://openbabel.org/wiki/THANKS"
 bug-reports: "https://github.com/ocaml/opam-repository/issues"
-build: [["pkg-config" "openbabel-3"]]
+build: [["sh" "-c" "pkg-config openbabel-2.0 || pkg-config openbabel-3"]]
 depends: ["conf-pkg-config" {build}]
 x-ci-accept-failures: ["debian-11" "debian-unstable" "alpine-3.18"]
 depexts: [