XXX No /proc filesystem on OpenBSD.

Index: src/xdp-app-info.c
--- src/xdp-app-info.c.orig
+++ src/xdp-app-info.c
@@ -512,6 +512,9 @@ xdp_app_info_get_path_for_fd (XdpAppInfo   *app_info,
                               gboolean     *writable_out,
                               GError      **error)
 {
+#ifdef __OpenBSD__
+  return NULL;
+#else
   XdpAppInfoPrivate *priv = xdp_app_info_get_instance_private (app_info);
   g_autofree char *proc_path = NULL;
   int fd_flags;
@@ -676,6 +679,7 @@ xdp_app_info_get_path_for_fd (XdpAppInfo   *app_info,
     *writable_out = writable;
 
   return g_steal_pointer (&path);
+#endif
 }
 
 gboolean
