--- tests/bn_isqrt.c.orig Fri Dec 9 11:05:26 2022 +++ tests/bn_isqrt.c Fri Dec 9 11:12:37 2022 @@ -306,6 +306,7 @@ main(int argc, char *argv[]) int ch; int failed = 0, print = 0; +#ifndef _MSC_VER while ((ch = getopt(argc, argv, "C")) != -1) { switch (ch) { case 'C': @@ -316,6 +317,7 @@ main(int argc, char *argv[]) break; } } +#endif if (print) return check_tables(1);