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

fusl/src/network/inet_ntop.c

+#include <sys/socket.h>
+#include <arpa/inet.h>
+#include <errno.h>
+#include <stdio.h>
+#include <string.h>
+
+const char *inet_ntop(int af, const void *restrict a0, char *restrict s, socklen_t l)
+{
+        const unsigned char *a = a0;
+        int i, j, max, best;
+        char buf[100];
+
+        switch (af) {
+        case AF_INET:
+                if (snprintf(s, l, "%d.%d.%d.%d", a[0],a[1],a[2],a[3]) < l)
+                        return s;
+                break;
+        case AF_INET6:
+                if (memcmp(a, "\0\0\0\0\0\0\0\0\0\0\377\377", 12))
+                        snprintf(buf, sizeof buf,
+                                "%x:%x:%x:%x:%x:%x:%x:%x",
+                                256*a[0]+a[1],256*a[2]+a[3],
+                                256*a[4]+a[5],256*a[6]+a[7],
+                                256*a[8]+a[9],256*a[10]+a[11],
+                                256*a[12]+a[13],256*a[14]+a[15]);
+                else
+                        snprintf(buf, sizeof buf,
+                                "%x:%x:%x:%x:%x:%x:%d.%d.%d.%d",
+                                256*a[0]+a[1],256*a[2]+a[3],
+                                256*a[4]+a[5],256*a[6]+a[7],
+                                256*a[8]+a[9],256*a[10]+a[11],
+                                a[12],a[13],a[14],a[15]);
+                /* Replace longest /(^0|:)[:0]{2,}/ with "::" */
+                for (i=best=0, max=2; buf[i]; i++) {
+                        if (i && buf[i] != ':') continue;
+                        j = strspn(buf+i, ":0");
+                        if (j>max) best=i, max=j;
+                }
+                if (max>2) {
+                        buf[best] = buf[best+1] = ':';
+                        memmove(buf+best+2, buf+best+max, i-best-max+1);
+                }
+                if (strlen(buf) < l) {
+                        strcpy(s, buf);
+                        return s;
+                }
+                break;
+        default:
+                errno = EAFNOSUPPORT;
+                return 0;
+        }
+        errno = ENOSPC;
+        return 0;
+}