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

fusl/src/string/strverscmp.c

+#define _GNU_SOURCE
+#include <ctype.h>
+#include <string.h>
+
+int strverscmp(const char *l0, const char *r0)
+{
+        const unsigned char *l = (const void *)l0;
+        const unsigned char *r = (const void *)r0;
+        size_t i, dp, j;
+        int z = 1;
+
+        /* Find maximal matching prefix and track its maximal digit
+         * suffix and whether those digits are all zeros. */
+        for (dp=i=0; l[i]==r[i]; i++) {
+                int c = l[i];
+                if (!c) return 0;
+                if (!isdigit(c)) dp=i+1, z=1;
+                else if (c!='0') z=0;
+        }
+
+        if (l[dp]!='0' && r[dp]!='0') {
+                /* If we're not looking at a digit sequence that began
+                 * with a zero, longest digit string is greater. */
+                for (j=i; isdigit(l[j]); j++)
+                        if (!isdigit(r[j])) return 1;
+                if (isdigit(r[j])) return -1;
+        } else if (z && dp<i && (isdigit(l[i]) || isdigit(r[i]))) {
+                /* Otherwise, if common prefix of digit sequence is
+                 * all zeros, digits order less than non-digits. */
+                return (unsigned char)(l[i]-'0') - (unsigned char)(r[i]-'0');
+        }
+
+        return l[i] - r[i];
+}