For https://github.com/sbt/sbt/pull/1039

gistfile1.sh

#!/bin/bash

sudo apt-get install openjdk-7-jdk curl
[[ -e sbt-launch.jar ]] || curl -L -o sbt-launch.jar http://repo.typesafe.com/typesafe/ivy-releases/org.scala-sbt/sbt-launch/0.13.1/sbt-launch.jar
if [ -e dummy ]  ; then
        echo "dummy project exists"
else
        mkdir -p dummy/project
        echo 'sbt.version=0.13.1' > dummy/build.properties
        echo 'object MyApp extends App { println("hello sbt") }' > dummy/MyApp.scala
        # This works:
        echo 'addSbtPlugin("com.earldouglas" % "xsbt-web-plugin" % "0.5.0")' > dummy/project/web.sbt
        # Neither of these work:
#       echo 'libraryDependencies += "com.earldouglas" %% "xsbt-web-plugin" % "0.5.0"' > dummy/project/plugins.sbt
#       echo 'libraryDependencies += "com.earldouglas" % "xsbt-web-plugin" % "0.5.0"' > dummy/project/plugins.sbt

        cat > dummy/project/Build.scala <<EOF
import sbt._
import Keys._
object DummyBuild extends Build {
        lazy val root = Project(
                id = "dummy_project",
                base = file(".")
        )

        lazy val sub = Project(
                id = "sub_project",
                base = file("sub")
        )
}
EOF

        mkdir -p dummy/sub
        echo 'object MySubApp { def plusOne(i: Int) = i + 1 }' > dummy/sub/MySubApp.scala

fi
cd dummy
SBT_OPTS="-Xms512M -Xmx1536M -Xss1M -XX:+CMSClassUnloadingEnabled -XX:MaxPermSize=256M"
java $SBT_OPTS -jar ../sbt-launch.jar "$@"

Try this on a clean Linux installation, e.g. saucy64 on a Vagrant instance.