I'm pretty sure the nativepackager
thing is needed to create a package, even with WebWorks. You'll find it in $BBNDK/host_10_x_xx_xxxx/linux/x86/usr/bin/blackberry-nativepackager
(adapt to your OS). You'll need to add this folder to your path. Doing this depends on your OS.
The easiest way to do this is to run the bbndk-env
script, located in your NDK root directory.