diff --git a/xw/build.sbt b/xw/build.sbt
index a309542..ce50473 100644
--- a/xw/build.sbt
+++ b/xw/build.sbt
@@ -20,7 +20,7 @@ netLogoZipSources := false
 netLogoTarget :=
     org.nlogo.build.NetLogoExtension.directoryTarget(baseDirectory.value)
 
-netLogoVersion := "6.0.4"
+netLogoVersion := "6.1.1"
 
 libraryDependencies ++= Seq(
   "org.ow2.asm" % "asm-all" % "5.0.4" % "test",
@@ -36,33 +36,32 @@ test in Test := {
 
 val jarName = "xw.jar"
 
-packageBin in Compile <<= (packageBin in Compile, baseDirectory, dependencyClasspath in Runtime) map {
-  (jar, base, classPath) =>
-    IO.copyFile(jar, base / jarName)
-    val jarFiles = classPath.files
+packageBin in Compile := {
+    IO.copyFile((packageBin in Compile).value, baseDirectory.value / jarName)
+    val jarFiles = (dependencyClasspath in Runtime).value.files
       .filter { _.getName matches "(.*).jar" }
       .filterNot { _.getName matches "netlogo(.*).jar" }
       .filterNot { _.getName matches "scala-library(.*).jar" }
-    jarFiles.foreach(file => IO.copyFile(file, base / file.getName))
+    jarFiles.foreach(file => IO.copyFile(file, baseDirectory.value / file.getName))
     // copy everything thing we need for distribution in a
     // temp "xw" directory, which we will zip before deleting it.
-    IO.createDirectory(base / "xw")
+    IO.createDirectory(baseDirectory.value / "xw")
     val fileNames = jarFiles.map(_.getName) :+ "xw.jar"
-    for (fn <- fileNames) IO.copyFile(base / fn, base / "xw" / fn)
-    IO.createDirectory(base / "xw" / "widgets")
+    for (fn <- fileNames) IO.copyFile(baseDirectory.value / fn, baseDirectory.value / "xw" / fn)
+    IO.createDirectory(baseDirectory.value / "xw" / "widgets")
     for {
-      path <- (base / "widgets").listFiles
+      path <- (baseDirectory.value / "widgets").listFiles
       if path.isDirectory
       file <- path.listFiles
       if file.getName.endsWith(".jar")
     } {
-      IO.createDirectory(base / "xw" / "widgets" / path.getName)
-      IO.copyFile(file, base / "xw" / "widgets" / path.getName / file.getName)
+      IO.createDirectory(baseDirectory.value / "xw" / "widgets" / path.getName)
+      IO.copyFile(file, baseDirectory.value / "xw" / "widgets" / path.getName / file.getName)
     }
-    IO.delete(base / "xw.zip")
-    Process(Seq("zip", "-r", "xw.zip", "xw"), base).!!
-    IO.delete(base / "xw")
-    jar
+    IO.delete(baseDirectory.value / "xw.zip")
+    scala.sys.process.Process(Seq("zip", "-r", "xw.zip", "xw"), baseDirectory.value).!!
+    IO.delete(baseDirectory.value / "xw")
+    (packageBin in Compile).value
 }
 
-cleanFiles <++= baseDirectory { base => Seq(base / jarName) }
+cleanFiles += baseDirectory.value / jarName
diff --git a/xw/project/build.properties b/xw/project/build.properties
new file mode 100644
index 0000000..654fe70
--- /dev/null
+++ b/xw/project/build.properties
@@ -0,0 +1 @@
+sbt.version=1.3.12
diff --git a/xw/project/plugins.sbt b/xw/project/plugins.sbt
new file mode 100644
index 0000000..d1753d4
--- /dev/null
+++ b/xw/project/plugins.sbt
@@ -0,0 +1,6 @@
+resolvers += Resolver.url(
+  "NetLogo-JVM",
+  url("https://dl.bintray.com/content/netlogo/NetLogo-JVM"))(
+    Resolver.ivyStylePatterns)
+
+addSbtPlugin("org.nlogo" % "netlogo-extension-plugin" % "3.2")