The build instructions on the sourceforge site utilize QEME which is available for Linux and Windows.
Also fdisk is available for many operating systems but disklabel will be a challenge. I have not taken time to play with it but this article indicates that linux fdisk can make the needed slices/partitions. Your mileage may vary and if I were in your shoes I would try QEME first.
http://tldp.org/HOWTO/Linux+FreeBSD-2.html