sg_securelevel_panic.c: In function 'main':
sg_securelevel_panic.c:65:54: warning: implicit declaration of function 'strerror'; did you mean 'perror'? [-Wimplicit-function-declaration]
     printf("%s: open %s failed: %s\n", argv[0], dev, strerror(errno));
                                                      ^~~~~~~~
                                                      perror
BUILD_EXIT=0
-rwxr-xr-x  1 root  wheel  7824 Jul 19 16:25 sg_securelevel_panic