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---
layout: doc-page
title: Building Dotty with Eclipse
---
Build setup
-----------
1. Run `sbt eclipse`
2. It is recommended to change the default output folder (in `Properties > java
build path > Source`) to `dotty/classes` instead of `dotty/bin` because
`dotty/bin` is reserved for shell scripts.
If you have `CLASSPATH` defined:
3. Update your classpath to contain any new required external libraries to run
`./bin/dotc`, `./bin/dotr` outside of Eclipse.
4. Open the `Run Configurations` tab, and edit the `tests` configuration so
that it contains a `CLASSPATH` variable which reflects the current
`CLASSPATH`.
In order for compilation errors related to `ENUM` to be resolved, make sure
that scala-reflect 2.11.5 is on the classpath.
Running the compiler Main class from Eclipse
--------------------------------------------
1. Navigate to `dotty.tools.dotc.Main`
2. `Run As... > Scala Application`
3. `Run Configurations > Main$ > Classpath > Bootstrap entries`:
- Add the Scala library (`Advanced...` > `Add library...` > `Scala library`)
- Add the Dotty classfiles (`Add projects...` > `[x] dotty`)
4. `Run Configurations > Main$ > Arguments` and add
`${project_loc}/tests/pos/HelloWorld.scala`
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