depends SSL &&
depends tdb &&
case "$HOST" in
  (*-musl)
    # remove when/if musl implements REG_STARTEND
    depends pcre2 --enable-pcre2
    ;;
  (*)
    optional_depends pcre2 \
		     --enable-pcre2 \
		     --disable-pcre2 \
		     'to enable PCREs in addition to POSIX regexps'
    ;;
esac
