pkgconf_fragment_has_system_dir
if (!(want_flags & PKG_KEEP_SYSTEM_CFLAGS) && pkgconf_fragment_has_system_dir(client, frag))
if (!(want_flags & PKG_KEEP_SYSTEM_LIBS) && pkgconf_fragment_has_system_dir(client, frag))
PKGCONF_API bool pkgconf_fragment_has_system_dir(const pkgconf_client_t *client, const pkgconf_fragment_t *frag);