diff --git a/uncore/chisel-dependent.sbt b/uncore/chisel-dependent.sbt
new file mode 100644
index 00000000..fa8d5490
--- /dev/null
+++ b/uncore/chisel-dependent.sbt
@@ -0,0 +1,6 @@
+// Provide a managed dependency on chisel if -DchiselVersion="" is
+// supplied on the command line.
+
+val chiselVersion = System.getProperty("chiselVersion", "None")
+
+libraryDependencies ++= ( if (chiselVersion != "None" ) ("edu.berkeley.cs" %% "chisel" % chiselVersion) :: Nil; else Nil)