if enabled libbluray_external; then
    if $(pkg-config --atleast-version="0.9.3" libbluray); then
        use_pkg_config libbluray libbluray libbluray/bluray.h bd_open
    else
        case $target_os in
            linux)
                # Some older supported linux versions don't have a
                # libbluray current enough to support MythTV.  Allow
                # only those systems to reach the bottom of the
                # following case statement.  This list should only
                # shrink over time.
                . /etc/os-release
                case $ID in
                    centos)
                        if test $VERSION_ID -gt 7; then
                            die "ERROR: can not find libbluray."
                        fi
                        ;;
                    ubuntu)
                        case $VERSION_ID in
                            17*|18*|19*|2*)
                                die "ERROR: can not find libbluray."
                                ;;
                        esac
                        ;;
                    debian)
                        if test $VERSION_ID -gt 8; then
                            die "ERROR: can not find libbluray."
                        fi
                        ;;
                    *)
                        die "ERROR: can not find libbluray."
                        ;;
                esac
                disable libbluray_external
                ;;
            *)
                # FreeBSD provides libbluray 1.0.2
                # All others unknown.
                die "ERROR: can not find libbluray."
                ;;
        esac
    fi
fi