Source Code Preparation
Programs that use ECL classes must include the ECL header files to obtain class definitions and other compile-time information. Although, it is possible to include only the subset of header files the application requires, for simplicity, it is recommended that applications include all ECL header files using the ECALL.HPP file.
Any C++ source file which contains references to ECL objects or
definitions should have the following statement before the first reference:
#include "eclall.hpp"