# Where is the ModuleRules class defined?

**URL:** <https://forums.unrealengine.com/t/where-is-the-modulerules-class-defined/282909>\
**Category:** Platform & Builds\
**Tags:** build, buildcs, unreal-engine, building, CPP, question\
**Created:** [May 9, 2014, 10:58am UTC](https://forums.unrealengine.com/t/where-is-the-modulerules-class-defined/282909 "2014-05-09T10:58:25Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![Milly01](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Milly01](https://forums.unrealengine.com/u/Milly01)\
**Post date:** [May 9, 2014, 10:58am UTC](https://forums.unrealengine.com/t/where-is-the-modulerules-class-defined/282909/1 "2014-05-09T10:58:25Z")

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Hi Everyone,

I’m looking to make some changes to our Build.cs file to improve our build process, and I have been trying to find the definition of the **ModuleRules** class to no avail.

I’ve done a search in the Unreal Engine source directories, and looked through the wiki/docs/forums.

More specifically, I want to introduce behavior that checks if entries have been added to things like ‘PublicIncludePaths’ and ‘Definitions’ (via ‘Definitions.Add(…)’ etc) and perform different tasks based on that.

Can anyone point me to any documentation/source location for the ModuleRules class itself?

Thanks

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**Author:** ![Ehamloptiran\_1](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Ehamloptiran\_1](https://forums.unrealengine.com/u/Ehamloptiran_1)\
**Post date:** [May 9, 2014, 11:28am UTC](https://forums.unrealengine.com/t/where-is-the-modulerules-class-defined/282909/2 "2014-05-09T11:28:32Z")

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You will find ModuleRules in "UnrealBuildTool\System\RulesCompiler.cs abstract class starting at line 68

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**Author:** ![Milly01](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Milly01](https://forums.unrealengine.com/u/Milly01)\
**Post date:** [May 9, 2014, 11:50am UTC](https://forums.unrealengine.com/t/where-is-the-modulerules-class-defined/282909/3 "2014-05-09T11:50:54Z")

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Thanks, Ehamloptiran. Exactly what I needed.

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**Author:** ![RotemS](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@RotemS](https://forums.unrealengine.com/u/RotemS)\
**Post date:** [February 19, 2017, 5:10pm UTC](https://forums.unrealengine.com/t/where-is-the-modulerules-class-defined/282909/4 "2017-02-19T17:10:17Z")

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No longer true. It is now found in UnrealBuildTool/Configuration/ModuleRules.cs

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**Author:** ![FilAl](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@FilAl](https://forums.unrealengine.com/u/FilAl)\
**Post date:** [October 19, 2017, 8:23am UTC](https://forums.unrealengine.com/t/where-is-the-modulerules-class-defined/282909/5 "2017-10-19T08:23:16Z")

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