How to install RPM package on Angstrom

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http://unix.stackexchange.com – I'm using an embedded system with the Angstrom distribution on it. Now i'd like to configure a GPRS-Modem for it. So I downloaded the linux-driver from the homepage of the manufacterer to install it on my embedded system. But the package is a RPM-File, and the readme-file gives me the command: rpm -ivv <packagename> But there is no "rpm" command on my embedded-system (only opkg), and this isn't working for a rpm package. Help would be greatly appreciated. (HowTos)