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During the development of Visual DataFlex 12.0 we modified the compiler to track any changes to source code that belong to a precompiled package. For example, let's say you have a precompiled package (MyPrecompile.pkg) and one of the files used by MyPrecompile.pkg was edited since it was last precompiled. Now, when you go to compile a project that uses this precompile, the Compiler would detect the change and raise an error that the precompile is out of date. This was a good change ...