--- zip-2.31/fileio.c
+++ zip-2.31/fileio.c
@@ -860,7 +860,18 @@
   }
 #else
   strcat(t, "ziXXXXXX"); /* must use lowercase for Linux dos file system */
+#ifdef NO_MKSTEMP
   return mktemp(t);
+#else
+  {
+    int fd;
+
+    if ((fd = mkstemp(t)) < 0)
+      return NULL;
+    close(fd);
+  }
+  return t;
+#endif
 #endif /* NO_MKTEMP */
 #endif /* TANDEM */
 #endif /* CMS_MVS */