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4.2.1 Pragma prereq

The #pragma prereq statement ensures that the correct mailfromd version is used to compile the source file it appears in. It takes version number as its arguments and produces a compilation error if the actual mailfromd version number is earlier than that. For example, the following statement:

#pragma prereq 7.0.94

results in error if compiled with mailfromd version 7.0.93 or prior.