diff -Nurp dnsmasq-2.80.orig/src/dnsmasq.h dnsmasq-2.80/src/dnsmasq.h
--- dnsmasq-2.80.orig/src/dnsmasq.h	2018-10-18 21:21:55.000000000 +0300
+++ dnsmasq-2.80/src/dnsmasq.h	2019-12-13 02:10:37.798356042 +0200
@@ -138,6 +138,7 @@ typedef unsigned long long u64;
 #endif
 
 #if defined(HAVE_LINUX_NETWORK)
+#include <linux/sockios.h>
 #include <linux/capability.h>
 /* There doesn't seem to be a universally-available 
    userspace header for these. */