diff --git a/project/build/InstallExtractProject.scala b/project/build/InstallExtractProject.scala
index 1c1c01bfa..e2202f5ff 100644
--- a/project/build/InstallExtractProject.scala
+++ b/project/build/InstallExtractProject.scala
@@ -6,31 +6,24 @@ import sbt._
 import java.io.File
 
 // TODO: use ProguardProject
-protected class InstallExtractProject(info: ProjectInfo, pluginProject: => InstallPluginProject) extends DefaultProject(info) with NoPublish
+protected class InstallExtractProject(info: ProjectInfo, pluginProject: => InstallPluginProject) extends DefaultProject(info) with NoPublish with ProguardProject
 {
 	override def unmanagedClasspath = super.unmanagedClasspath +++ info.sbtClasspath
+	override def rawPackage = `package`
+	override def rawJarPath = jarPath
+
 	private lazy val plugin = pluginProject
 	val mainClassName = "sbt.extract.Main"
-	val proguardConfigurationPath: Path = outputPath / "proguard.pro"
-	val toolsConfig = config("tools")
 	val defaultConfig = Configurations.Default
-	val proguardJar = "net.sf.proguard" % "proguard" % "4.3" % "tools"
-	def rootProjectDirectory = rootProject.info.projectPath
 	def outputJar = (plugin.outputPath ##) / defaultJarName
-	
+	override val proguardConfigurationPath: Path = outputPath / "proguard.pro"
+
 	/******** Proguard  *******/
-	lazy val proguard = proguardTask dependsOn(`package`, writeProguardConfiguration, cleanProguard)
-	lazy val writeProguardConfiguration = writeProguardConfigurationTask dependsOn `package`
+	override lazy val proguard = proguardTask dependsOn(`package`, writeProguardConfiguration, cleanProguard)
+	override lazy val writeProguardConfiguration = writeProguardConfigurationTask dependsOn `package`
 	lazy val cleanProguard = cleanTask(outputJar)
-	private def proguardTask =
-		task
-		{
-			val proguardClasspathString = Path.makeString(managedClasspath(toolsConfig).get)
-			val configFile = proguardConfigurationPath.asFile.getAbsolutePath
-			val exitValue = Process("java", List("-Xmx256M", "-cp", proguardClasspathString, "proguard.ProGuard", "@" + configFile)) ! log
-			if(exitValue == 0) None else Some("Proguard failed with nonzero exit code (" + exitValue + ")")
-		}
-	private def writeProguardConfigurationTask =
+
+	override protected def writeProguardConfigurationTask =
 		task
 		{
 			// the template for the proguard configuration file
@@ -39,15 +32,15 @@ protected class InstallExtractProject(info: ProjectInfo, pluginProject: => Insta
 				|-dontobfuscate
 				|-dontnote
 				|-dontwarn
-				|-libraryjars %s
+				|-libraryjars "%s"
 				|%s
-				|-outjars %s
+				|-outjars "%s"
 				|-ignorewarnings
 				|-keep public class %s {
 				|    public static void main(java.lang.String[]);
 				|}"""
-			
-			val defaultJar = jarPath.absolutePath
+
+			val defaultJar = mkpath(jarPath.absolutePath, '\"')
 			log.debug("proguard configuration using main jar " + defaultJar)
 			val externalDependencies = (mainCompileConditional.analysis.allExternals).map(_.getAbsoluteFile).filter(_.getName.endsWith(".jar"))
 			debugJars("external dependencies", externalDependencies)
@@ -55,14 +48,15 @@ protected class InstallExtractProject(info: ProjectInfo, pluginProject: => Insta
 			// if they are, they are specified with -injars, otherwise they are specified with -libraryjars
 			val (externalJars, libraryJars) = externalDependencies.toList.partition{jar => Path.relativize(rootProjectDirectory, jar).isDefined}
 			debugJars("library jars", libraryJars)
-			val externalJarStrings = externalJars.map( _ + "(!META-INF/**,!*.properties)")
+			val externalJarStrings = externalJars.map( mkpath(_) + "(!META-INF/**,!*.properties)")
 			// exclude properties files and manifests from scala-library jar
 			val inJars = (defaultJar :: externalJarStrings).map("-injars " + _).mkString("\n")
-			
+
 			val proguardConfiguration = outTemplate.stripMargin.format(libraryJars.mkString(File.pathSeparator), inJars, outputJar.absolutePath, mainClassName)
 			log.debug("Proguard configuration written to " + proguardConfigurationPath)
 			FileUtilities.write(proguardConfigurationPath.asFile, proguardConfiguration, log)
 		}
+	
 	private def debugJars[T](label: String, jars: Iterable[T]): Unit =
 		log.debug("proguard configuration " + label + ": \n\t" + jars.mkString("\n\t"))
 }
\ No newline at end of file
diff --git a/project/build/ProguardProject.scala b/project/build/ProguardProject.scala
index b9cd9145d..339116fd2 100644
--- a/project/build/ProguardProject.scala
+++ b/project/build/ProguardProject.scala
@@ -62,17 +62,18 @@ trait ProguardProject extends BasicScalaProject
 		lines.mkString("\n")
 	}
 
-	def mkpath(f: File) = '\"' + f.getAbsolutePath + '\"'
-	private def proguardTask =
+	def mkpath(f: File) : String = mkpath(f.getAbsolutePath, '\"')
+	def mkpath(path: String, delimiter : Char) : String = delimiter + path + delimiter
+	protected def proguardTask =
 		task
 		{
 			FileUtilities.clean(outputJar :: Nil, log)
-			val proguardClasspathString = Path.makeString(managedClasspath(toolsConfig).get)
-			val configFile = proguardConfigurationPath.asFile.getAbsolutePath
-			val exitValue = Process("java", List("-Xmx256M", "-cp", proguardClasspathString, "proguard.ProGuard", "@" + configFile)) ! log
+			val proguardClasspathString = Path.makeString(managedClasspath(toolsConfig).get) 
+			val configFile = mkpath(proguardConfigurationPath.asFile.getAbsolutePath, '\'')
+			val exitValue = Process("java", List("-Xmx256M", "-cp", proguardClasspathString, "proguard.ProGuard", "-include " + configFile)) ! log
 			if(exitValue == 0) None else Some("Proguard failed with nonzero exit code (" + exitValue + ")")
 		}
-	private def writeProguardConfigurationTask =
+	protected def writeProguardConfigurationTask =
 		task
 		{
 			val dependencies = mainDependencies.snapshot
@@ -88,4 +89,4 @@ trait ProguardProject extends BasicScalaProject
 			log.debug("Proguard configuration written to " + proguardConfigurationPath)
 			FileUtilities.write(proguardConfigurationPath.asFile, proguardConfiguration, log)
 		}
-}
\ No newline at end of file
+}