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Ant allows easily include or exclude files from compilation. But it's hidden from user in new buildsys. There should be some UI (similar to jar creation) to allow to set in/exclude sets for compilation. If user has part of his source base in uncompilable state he has to either copy those files somewhere else or rename them, ...
java/code->java/project
Not so trivial as setting the includes/excludes list in the build script, because classpath scanning will not grok it without a rather more complex API change. *** This issue has been marked as a duplicate of 49026 ***