--- include/uapi/linux/libc-compat.h.orig
+++ include/uapi/linux/libc-compat.h
@@ -165,10 +165,102 @@
 #define __UAPI_DEF_XATTR		1
 #endif
 
+
+/*
+ * Support of guessed LIBC musl, since neither glibc nor kernel space.
+ * Written for musl libc 1.1.16. Mimics the glibc support above.
+ */
+#elif !defined(__KERNEL__) /* and not __GLIBC__ */
+
+/* Coordinate with musl libc net/if.h header. */
+#if defined(_NET_IF_H)
+
+/* LIBC headers included first so don't define anything
+ * that would already be defined. */
+
+#define __UAPI_DEF_IF_IFCONF		0
+#define __UAPI_DEF_IF_IFMAP		0
+#define __UAPI_DEF_IF_IFNAMSIZ		0
+#define __UAPI_DEF_IF_IFREQ		0
+
+/* Everything up to IFF_DYNAMIC, matches net/if.h */
+#define __UAPI_DEF_IF_NET_DEVICE_FLAGS	0
+
+/* musl libc defines IFF_LOWER_UP, IFF_DORMANT and IFF_ECHO */
+#define __UAPI_DEF_IF_NET_DEVICE_FLAGS_LOWER_UP_DORMANT_ECHO 0
+
+#else /* _NET_IF_H */
+
+/* Linux headers included first, and we must define everything
+ * we need. Will define the corresponding structures twice
+ * if net/if.h is included later ?  */
+
+#define __UAPI_DEF_IF_IFCONF		1
+#define __UAPI_DEF_IF_IFMAP		1
+#define __UAPI_DEF_IF_IFNAMSIZ		1
+#define __UAPI_DEF_IF_IFREQ		1
+#define __UAPI_DEF_IF_NET_DEVICE_FLAGS	1
+#define __UAPI_DEF_IF_NET_DEVICE_FLAGS_LOWER_UP_DORMANT_ECHO 1
+
+#endif /* _NET_IF_H */
+
+/* Coordinate with musl libc netinet/in.h header. */
+#if defined(_NETINET_IN_H)
+
+/* musl 1.1.16 LIBC netinet/in.h defines the following (to 0),
+ * so it's useless to set them again:
+ *   __UAPI_DEF_IN_ADDR        __UAPI_DEF_IN_IPPROTO
+ *   __UAPI_DEF_IN_PKTINFO     __UAPI_DEF_IP_MREQ
+ *   __UAPI_DEF_SOCKADDR_IN    __UAPI_DEF_IN_CLASS
+ *   __UAPI_DEF_IN6_ADDR       __UAPI_DEF_IN6_ADDR_ALT
+ *   __UAPI_DEF_SOCKADDR_IN6   __UAPI_DEF_IPV6_MREQ
+ *   __UAPI_DEF_IPPROTO_V6     __UAPI_DEF_IPV6_OPTIONS
+ *   __UAPI_DEF_IN6_PKTINFO    __UAPI_DEF_IP6_MTUINFO
+ */
+
+#else /* _NETINET_IN_H */
+
+/* Linux headers included first, and we must define everything
+ * we need. Will define the corresponding structures twice
+ * if netinet/in.h is included later ? */
+
+#define __UAPI_DEF_IN_ADDR		1
+#define __UAPI_DEF_IN_IPPROTO		1
+#define __UAPI_DEF_IN_PKTINFO		1
+#define __UAPI_DEF_IP_MREQ		1
+#define __UAPI_DEF_SOCKADDR_IN		1
+#define __UAPI_DEF_IN_CLASS		1
+
+#define __UAPI_DEF_IN6_ADDR		1
+#define __UAPI_DEF_IN6_ADDR_ALT		1
+#define __UAPI_DEF_SOCKADDR_IN6		1
+#define __UAPI_DEF_IPV6_MREQ		1
+#define __UAPI_DEF_IPPROTO_V6		1
+#define __UAPI_DEF_IPV6_OPTIONS		1
+#define __UAPI_DEF_IN6_PKTINFO		1
+#define __UAPI_DEF_IP6_MTUINFO		1
+
+#endif /* _NETINET_IN_H */
+
+/* musl libc does not provide IPX support */
+#define __UAPI_DEF_SOCKADDR_IPX			1
+#define __UAPI_DEF_IPX_ROUTE_DEFINITION		1
+#define __UAPI_DEF_IPX_INTERFACE_DEFINITION	1
+#define __UAPI_DEF_IPX_CONFIG_DATA		1
+#define __UAPI_DEF_IPX_ROUTE_DEF		1
+
+/* Definitions for sys/xattr.h */
+#if defined(_SYS_XATTR_H)
+#define __UAPI_DEF_XATTR		0
+#else
+#define __UAPI_DEF_XATTR		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
  * that we need. */
-#else /* !defined(__GLIBC__) */
+#else /* defined(__KERNEL__) */
 
 /* Definitions for if.h */
 #define __UAPI_DEF_IF_IFCONF 1
@@ -208,6 +300,6 @@
 /* Definitions for xattr.h */
 #define __UAPI_DEF_XATTR		1
 
-#endif /* __GLIBC__ */
+#endif /* __KERNEL__ or __GLIBC__ or libc */
 
 #endif /* _LIBC_COMPAT_H */