- << " -u, --upgrade upgrade package with the same name" << endl
- << " -f, --force force install, overwrite conflicting files" << endl
- << " -r, --root <path> specify alternative installation root" << endl
- << " -v, --version print version and exit" << endl
- << " -h, --help print help and exit" << endl;
+ << " -u, --upgrade upgrade package with the same name" << endl
+ << " -f, --force force install, overwrite conflicting files" << endl
+ << " -r, --root <path> specify alternative installation root" << endl
+ << " -c, --config <file> use alternate configuration file" << endl
+ << " -v, --version print version and exit" << endl
+ << " -h, --help print help and exit" << endl;