Scala 2.9.1 + Ensime 0.7.6 + SBT 0.11.0 でensime-sbtが動かない

エラー内容

        ...

	==== Scala-Tools Maven2 Snapshots Repository: tried

	  http://scala-tools.org/repo-snapshots/org/scala-tools/sbt/sbt_2.9.1/0.7.4/sbt_2.9.1-0.7.4.pom

		::::::::::::::::::::::::::::::::::::::::::::::

		::          UNRESOLVED DEPENDENCIES         ::

		::::::::::::::::::::::::::::::::::::::::::::::

		:: org.scala-tools.sbt#sbt_2.9.1;0.7.4: not found

		::::::::::::::::::::::::::::::::::::::::::::::



:: USE VERBOSE OR DEBUG MESSAGE LEVEL FOR MORE DETAILS
unresolved dependency: org.scala-tools.sbt#sbt_2.9.1;0.7.4: not found
Error during sbt execution: Error retrieving required libraries
  (see /Users/euler/.sbt/boot/update.log for complete log)
Error: Could not retrieve sbt 0.7.4

Process sbt exited abnormally with code 1

ensime-sbt-project-dir-pに"/project"をセットするか、空の/project/build.propertiesを作成すれば良いっぽい。

ref https://github.com/aemoncannon/ensime/issues/193