Rastertodpl
Rastertodpl is a driver filter that currently supports Datamax I Series label printers. The driver has been tested with a Datamax I-4206 Label Printer but may work with other models that support DPL. This filter is based on the rastertolabel filter currently in CUPS. It uses the PCX file format to send the raster output to Module D (DRAM) of the label printer. Then a label format is created using that image. All the printer commands used are documented from Datamax's DPL Programming Manual.
Prerequisites for Compiling
Besides making sure you have a development environment suitable for building applications, install the cups development packages associated with your distribution (maybe they are cups-devel or libcups2-dev).
Building
./configure --prefix=/usr
./make
sudo make install (or whatever tool you use to install as root)