Configuration maps can also specify lineups. Configuration map lineups specify the required maps for a configuration expression. The first expression to evaluate to true is used.

To see configuration map expressions, select Browse Configuration Maps from the Tools menu. The following graphic shows a Configuration Map Browser with the map WindowBuilder Pro - Runtime, which was in an earlier release of VA Smalltalk. This map has two configuration expressions.
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The two configuration expressions are

The first indicates a Windows platform; the second is everythin else, which means Unix.

Configuration map lineups explains how to write lineups for configuration maps.