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---
layout: doc-page
title: Building Dotty with Eclipse
---
Build setup
-----------
You may need to redo these steps when the build changes.
1. Run `sbt eclipse`
2. In dotty, go to `Properties > java build path > Libraries`.
Remove the Scala Compiler container (currently 2.11.4) and add as an
external jar the latest compiler version in the Ivy cache. This is
currently:
```
.ivy2/cache/me.d-d/scala-compiler/jars/scala-compiler-2.11.5-20160322-171045-e19b30b3cd.jar
```
But that might change in the future. Or, copy the latest scala compiler from
the cache to a stable name and use that as external jar.
3. 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:
4. Update your classpath to contain any new required external libraries to run
`./bin/dotc`, `./bin/dotr` outside of Eclipse.
5. 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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