The Include directive includes the content of a file in the compilation. Basically this is similar to the #INCLUDE directive in C. Example:

include "unittest.esx";

The files are searched for either in the standard library, or in the same folder as the main input file. If the file is in a subfolder, forward slashes is used to indicate the path: Example:

include "whizzers/zap.esx";

This locates the file zap in the folder whizzers which should be in the same folder as the main input file.

See also import.