+ } else if (!strcmp(p, "-o")) {
+ if (argc <= 1) {
+ fprintf(stderr,
+ "plink: option \"-o\" requires an argument\n");
+ errors = 1;
+ } else {
+ --argc;
+ provide_xrm_string(*++argv);
+ }
+ } else {
+ fprintf(stderr, "plink: unknown option \"%s\"\n", p);
+ errors = 1;