During the build any performs the next essential steps:

-

reads the data from configs and command line;

-

builds the shell script for building. It has all data from options as variables, and it has libraries of the engine with build functions; that is not anybuild from ports/packages/;

-

saves the given script into file;

-

calls functions for building in order.

The principle of build process with any remains the same as with manual execution of all needed commands. The difference is just in automatization through functions and in flexible handling of input data.