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|See also: dependencies among units, Using TNumLab|
Installation of non-visual components
I cannot install unit XYZ into the Delphi/C++Builder VCL. I get an undefined reference in the XYZ object that goes something like this:
Undefined reference XYA::Register() in .....
Some of the SDL units are non-visual components (for example MATH1, or MATRIX, or CDATA, ...) which cannot be installed into the VCL palette. The units are to be used in your application by simply including the unit name into the uses statement of your program (don't forget to set the library path to your unit files).