cpcgen_usage
cpcgen_usage("Option -%c requires an operand\n",
cpcgen_usage("Unknown option: -%c\n", optopt);
cpcgen_usage(NULL);
cpcgen_usage("Only one of -c, -h, and -m may be specified\n");
cpcgen_usage("One of -c, -h, and -m is required\n");
cpcgen_usage("Only one of -a and -p may be specified\n");
cpcgen_usage("One of -a and -p is required\n");
cpcgen_usage("Missing required output directory (-o)\n");
cpcgen_usage("Missing required data directory (-d)\n");