To ignore dependency errors, pass the -force-depends flag. Missing dependencies with third-party packages are probably available from the source of the package. The package manager opkg attempts to resolve dependencies with packages in the repositories - if this fails, it will report an error and abort the installation of that package. Opkg is sometimes called Entware, as it is used also in the Entware repository for embedded devices (a fork of OpenWrt community packages repository). Opkg is a full package manager for the root file system, including kernel modules and drivers, while ipkg is just a way to add software to a separate directory (e.g. Opkg is a fork of ipkg, the package manager used in NSLU2's Optware, which is designed to add software to stock firmware of embedded devices. The opkg utility is the lightweight package manager used for this job. Like most Linux distributions (or mobile device operating systems like say Android or iOS), the functionality of the system can be upgraded rather significantly by downloading and installing pre-made packages from package repositories (local or on the Internet).
