Add a "fork" of musl as //fusl.

fusl/include/ifaddrs.h

Index: fusl/include/ifaddrs.h
diff --git a/fusl/include/ifaddrs.h b/fusl/include/ifaddrs.h
new file mode 100644
index 0000000000000000000000000000000000000000..4726db6e09387019b54dd793b9faa658875669cc
--- /dev/null
+++ b/fusl/include/ifaddrs.h
@@ -0,0 +1,35 @@
+#ifndef _IFADDRS_H
+#define _IFADDRS_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <features.h>
+#include <netinet/in.h>
+#include <sys/socket.h>
+
+struct ifaddrs {
+	struct ifaddrs *ifa_next;
+	char *ifa_name;
+	unsigned ifa_flags;
+	struct sockaddr *ifa_addr;
+	struct sockaddr *ifa_netmask;
+	union {
+		struct sockaddr *ifu_broadaddr;
+		struct sockaddr *ifu_dstaddr;
+	} ifa_ifu;
+	void *ifa_data;
+};
+#define ifa_broadaddr ifa_ifu.ifu_broadaddr
+#define ifa_dstaddr ifa_ifu.ifu_dstaddr
+
+void freeifaddrs(struct ifaddrs *ifp);
+int getifaddrs(struct ifaddrs **ifap);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
+