diff -u -r linux-4.9.8-bak/include/uapi/linux/if_arp.h linux-4.9.8/include/uapi/linux/if_arp.h
--- include/uapi/linux/if_arp.h	2018-05-14 23:49:28.882768986 +0200
+++ include/uapi/linux/if_arp.h	2018-05-14 23:50:03.156912981 +0200
@@ -24,6 +24,7 @@
 #define _UAPI_LINUX_IF_ARP_H
 
 #include <linux/netdevice.h>
+#include <linux/libc-compat.h>
 
 /* ARP protocol HARDWARE identifiers. */
 #define ARPHRD_NETROM	0		/* from KA9Q: NET/ROM pseudo	*/
@@ -108,7 +109,7 @@
 #define	ARPOP_InREPLY	9		/* InARP reply			*/
 #define	ARPOP_NAK	10		/* (ATM)ARP NAK			*/
 
-
+#if __UAPI_DEF_ARPREQ
 /* ARP ioctl request. */
 struct arpreq {
   struct sockaddr	arp_pa;		/* protocol address		*/
@@ -117,13 +118,15 @@
   struct sockaddr       arp_netmask;    /* netmask (only for proxy arps) */
   char			arp_dev[16];
 };
-
+#endif
+#if __UAPI_DEF_ARPREQ_OLD
 struct arpreq_old {
   struct sockaddr	arp_pa;		/* protocol address		*/
   struct sockaddr	arp_ha;		/* hardware address		*/
   int			arp_flags;	/* flags			*/
   struct sockaddr       arp_netmask;    /* netmask (only for proxy arps) */
 };
+#endif
 
 /* ARP Flag values. */
 #define ATF_COM		0x02		/* completed entry (ha valid)	*/
@@ -133,7 +136,7 @@
 #define ATF_NETMASK     0x20            /* want to use a netmask (only
 					   for proxy entries) */
 #define ATF_DONTPUB	0x40		/* don't answer this addresses	*/
-
+#if __UAPI_DEF_ARPHDR
 /*
  *	This structure defines an ethernet arp header.
  */
@@ -156,6 +159,6 @@
 #endif
 
 };
-
+#endif
 
 #endif /* _UAPI_LINUX_IF_ARP_H */
diff -u -r linux-4.9.8-bak/include/uapi/linux/libc-compat.h linux-4.9.8/include/uapi/linux/libc-compat.h
--- include/uapi/linux/libc-compat.h	2018-05-14 23:49:28.885768999 +0200
+++ include/uapi/linux/libc-compat.h	2018-05-14 23:50:03.156912981 +0200
@@ -51,6 +51,11 @@
 /* We have included glibc headers... */
 #if defined(__GLIBC__)
 
+#define __UAPI_DEF_ETHHDR 1
+#define __UAPI_DEF_ARPREQ 1
+#define __UAPI_DEF_ARPREQ_OLD 1
+#define __UAPI_DEF_ARPHDR 1
+
 /* Coordinate with glibc net/if.h header. */
 #if defined(_NET_IF_H) && defined(__USE_MISC)
 
@@ -73,7 +78,6 @@
 /* Linux headers included first, and we must define everything
  * we need. The expectation is that glibc will check the
  * __UAPI_DEF_* defines and adjust appropriately. */
-
 #define __UAPI_DEF_IF_IFCONF 1
 #define __UAPI_DEF_IF_IFMAP 1
 #define __UAPI_DEF_IF_IFNAMSIZ 1
@@ -256,6 +260,21 @@
 #define __UAPI_DEF_XATTR		1
 #endif
 
+#ifdef _NETINET_IF_ETHER_H /* musl */
+#define __UAPI_DEF_ETHHDR 0
+#else
+#define __UAPI_DEF_ETHHDR 1
+#endif
+
+#ifdef _NET_IF_ARP_H
+#define __UAPI_DEF_ARPREQ 0
+#define __UAPI_DEF_ARPREQ_OLD 0
+#define __UAPI_DEF_ARPHDR 0
+#else
+#define __UAPI_DEF_ARPREQ 1
+#define __UAPI_DEF_ARPREQ_OLD 1
+#define __UAPI_DEF_ARPHDR 1
+#endif
 
 /* If we did not see any headers from any supported C libraries,
  * or we are being included in the kernel, then define everything
--- include/uapi/linux/if_ether.h	2018-11-01 21:25:05.338466089 +0100
+++ include/uapi/linux/if_ether.h	2018-11-01 21:26:07.819172903 +0100
@@ -23,6 +23,7 @@
 #define _UAPI_LINUX_IF_ETHER_H
 
 #include <linux/types.h>
+#include <linux/libc-compat.h>
 
 /*
  *	IEEE 802.3 Ethernet magic constants.  The frame sizes omit the preamble