--- A/configure.ac	2025-06-17 02:20:35.123997216 +0200
+++ B/configure.ac	2025-06-17 02:23:12.456392345 +0200
@@ -1284,6 +1284,7 @@
             AC_COMPILE_IFELSE(
                 [AC_LANG_PROGRAM(
                     [
+                    #include <sys/types.h>
                     #include <pfring.h>
                     ],
                     [