diff -rauN syslinux/extlinux/main.c syslinux-sysmacros-patch/extlinux/main.c
--- syslinux/extlinux/main.c	2018-08-10 11:28:39.164004538 +0200
+++ syslinux-sysmacros-patch/extlinux/main.c	2018-08-10 11:33:05.410671208 +0200
@@ -19,6 +19,7 @@
  */
 
 #define  _GNU_SOURCE		/* Enable everything */
+#include <sys/sysmacros.h>
 #include <inttypes.h>
 /* This is needed to deal with the kernel headers imported into glibc 3.3.3. */
 #include <alloca.h>