--- eudev-3.2.4.old/src/udev/udev.h 
+++ eudev-3.2.4/src/udev/udev.h
@@ -16,6 +16,8 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#ifndef __EUDEV_UDEV_H_LOADED__
+#define __EUDEV_UDEV_H_LOADED__ 1
 #pragma once
 
 #include <sys/sysmacros.h>
@@ -212,3 +214,4 @@
 extern const struct udevadm_cmd udevadm_hwdb;
 extern const struct udevadm_cmd udevadm_test;
 extern const struct udevadm_cmd udevadm_test_builtin;
+#endif