diff --git a/main/Defaults.scala b/main/Defaults.scala
index 5d7625ce8..aaa26e35d 100644
--- a/main/Defaults.scala
+++ b/main/Defaults.scala
@@ -1001,4 +1001,13 @@ trait BuildCommon
 		def classpath: Classpath = Attributed blankSeq s
 	}
 	def toError(o: Option[String]): Unit = o foreach error
+
+	def overrideConfigs(cs: Configuration*)(configurations: Seq[Configuration]): Seq[Configuration] =
+	{
+		val existingName = configurations.map(_.name).toSet
+		val newByName = cs.map(c => (c.name, c)).toMap
+		val overridden = configurations map { conf => newByName.getOrElse(conf.name, conf) }
+		val newConfigs = cs filter { c => !existingName(c.name) }
+		overridden ++ newConfigs
+	}
 }
\ No newline at end of file
diff --git a/main/Project.scala b/main/Project.scala
index b3d0f69a6..1be09a931 100644
--- a/main/Project.scala
+++ b/main/Project.scala
@@ -52,6 +52,7 @@ sealed trait Project extends ProjectDefinition[ProjectReference]
 		apply(id, base, aggregate = resolveRefs(aggregate), dependencies = resolveDeps(dependencies), delegates = resolveRefs(delegates), settings, configurations)
 	}
 
+	def overrideConfigs(cs: Configuration*): Project = copy(configurations = Defaults.overrideConfigs(cs : _*)(configurations))
 	def dependsOn(deps: ClasspathDep[ProjectReference]*): Project = copy(dependencies = dependencies ++ deps)
 	def delegateTo(from: ProjectReference*): Project = copy(delegates = delegates ++ from)
 	def aggregate(refs: ProjectReference*): Project = copy(aggregate = (aggregate: Seq[ProjectReference]) ++ refs)