From Forum Nokia Wiki

Firstly, run bldmake from the project directory (usually \group) where the bld.inf file is located:

bldmake bldfiles

This creates a batch file, called abld.bat, which you use in the next step.

To build the project, you call abld build which will build the project for all default targets in both release and debug variants. To build for a particular target and variant, use abld build target-name variant, for example:

abld build winscw udeb

builds the project for the debug variant of WINSCW only.