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+---
+layout: docs
+title:  "Developers"
+section: "chisel3"
+---
+
+## Chisel as an sbt subproject
+
+In order to use the constructs defined in the Chisel3 library, those definitions must be made available to the Scala
+compiler at the time a project dependent on them is compiled.
+For sbt-based builds there are fundamentally two ways to do this:
+* provide a library dependency on the published Chisel3 jars via sbt's `libraryDependencies` setting,
+* clone the Chisel3 git repository and include the source code as a subproject of a dependent project.
+
+The former of these two approaches is used by the chisel-tutorial project.
+It is the simplest approach and assumes you do not require tight control over Chisel3 source code and are content with the
+published release versions of Chisel3.
+
+The latter approach should be used by Chisel3 projects that require finer control over Chisel3 source code.
+
+It's hard to predict in advance the future requirements of a project, and it would be advantageous to be able to
+switch between the two approaches relatively easily.
+In order to accomplish this, we provide the `sbt-chisel-dep` plugin that allows the developer to concisely specify
+Chisel3 subproject dependencies and switch between subproject and library dependency support based on the presence of
+a directory (or symbolic link) in the root of the dependent project.
+
+The chisel-template project uses this plugin to support switching between either dependency (subproject or library).
+By default, the chisel-template project does not contain a chisel3 subproject directory, and hence, uses a library dependency
+on chisel3 (and related Chisel3 projects).
+However, if you clone the chisel3 GitHub project from the root directory of the chisel-template project, creating a chisel3
+subdirectory, the `sbt-chisel-dep` plugin will take note of the chisel3 project subdirectory,
+and provide an sbt subproject dependency in place of the library dependency.
+
+Checkout the [README for the `sbt-chisel-dep`](https://github.com/ucb-bar/sbt-chisel-dep) project for instructions on its usage.
+
+Example versions of the build.sbt and specification of the sbt-chisel-dep plugin are available from the [skeleton branch of the chisel-template repository](https://github.com/ucb-bar/chisel-template/tree/skeleton).