diff --git a/makefile b/makefile
index b444a5ce..86097c64 100644
--- a/makefile
+++ b/makefile
@@ -227,6 +227,7 @@ stage6:
 	$(VOCSTATIC) -sP MultiArrays.Mod
 	$(VOCSTATIC) -sP MultiArrayRiders.Mod
 	$(VOCSTATIC) -sP MersenneTwister.Mod
+	$(VOCSTATIC) -sP Listen.Mod
 	
 	#s3 libs
 	$(VOCSTATIC) -sP ethBTrees.Mod
diff --git a/makefile.gnuc.armv6j b/makefile.gnuc.armv6j
index b6f8d55f..5e1b5c54 100644
--- a/makefile.gnuc.armv6j
+++ b/makefile.gnuc.armv6j
@@ -227,6 +227,7 @@ stage6:
 	$(VOCSTATIC) -sP MultiArrays.Mod
 	$(VOCSTATIC) -sP MultiArrayRiders.Mod
 	$(VOCSTATIC) -sP MersenneTwister.Mod
+	$(VOCSTATIC) -sP Listen.Mod
 	
 	#s3 libs
 	$(VOCSTATIC) -sP ethBTrees.Mod
diff --git a/makefile.gnuc.armv6j_hardfp b/makefile.gnuc.armv6j_hardfp
index 2f1a1bb2..4961f4a2 100644
--- a/makefile.gnuc.armv6j_hardfp
+++ b/makefile.gnuc.armv6j_hardfp
@@ -227,6 +227,7 @@ stage6:
 	$(VOCSTATIC) -sP MultiArrays.Mod
 	$(VOCSTATIC) -sP MultiArrayRiders.Mod
 	$(VOCSTATIC) -sP MersenneTwister.Mod
+	$(VOCSTATIC) -sP Listen.Mod
 	
 	#s3 libs
 	$(VOCSTATIC) -sP ethBTrees.Mod
diff --git a/makefile.gnuc.armv7a_hardfp b/makefile.gnuc.armv7a_hardfp
index 3d0498a2..48e192cd 100644
--- a/makefile.gnuc.armv7a_hardfp
+++ b/makefile.gnuc.armv7a_hardfp
@@ -227,6 +227,7 @@ stage6:
 	$(VOCSTATIC) -sP MultiArrays.Mod
 	$(VOCSTATIC) -sP MultiArrayRiders.Mod
 	$(VOCSTATIC) -sP MersenneTwister.Mod
+	$(VOCSTATIC) -sP Listen.Mod
 	
 	#s3 libs
 	$(VOCSTATIC) -sP ethBTrees.Mod
diff --git a/makefile.gnuc.powerpc b/makefile.gnuc.powerpc
index 09002914..bb00e2af 100644
--- a/makefile.gnuc.powerpc
+++ b/makefile.gnuc.powerpc
@@ -227,6 +227,7 @@ stage6:
 	$(VOCSTATIC) -sP MultiArrays.Mod
 	$(VOCSTATIC) -sP MultiArrayRiders.Mod
 	$(VOCSTATIC) -sP MersenneTwister.Mod
+	$(VOCSTATIC) -sP Listen.Mod
 	
 	#s3 libs
 	$(VOCSTATIC) -sP ethBTrees.Mod
diff --git a/makefile.gnuc.x86 b/makefile.gnuc.x86
index ae19c11e..4cb8bfe6 100644
--- a/makefile.gnuc.x86
+++ b/makefile.gnuc.x86
@@ -227,6 +227,7 @@ stage6:
 	$(VOCSTATIC) -sP MultiArrays.Mod
 	$(VOCSTATIC) -sP MultiArrayRiders.Mod
 	$(VOCSTATIC) -sP MersenneTwister.Mod
+	$(VOCSTATIC) -sP Listen.Mod
 	
 	#s3 libs
 	$(VOCSTATIC) -sP ethBTrees.Mod
diff --git a/makefile.gnuc.x86_64 b/makefile.gnuc.x86_64
index b444a5ce..86097c64 100644
--- a/makefile.gnuc.x86_64
+++ b/makefile.gnuc.x86_64
@@ -227,6 +227,7 @@ stage6:
 	$(VOCSTATIC) -sP MultiArrays.Mod
 	$(VOCSTATIC) -sP MultiArrayRiders.Mod
 	$(VOCSTATIC) -sP MersenneTwister.Mod
+	$(VOCSTATIC) -sP Listen.Mod
 	
 	#s3 libs
 	$(VOCSTATIC) -sP ethBTrees.Mod
diff --git a/src/lib/misc/Listen.Mod b/src/lib/misc/Listen.Mod
new file mode 100644
index 00000000..a3263f39
--- /dev/null
+++ b/src/lib/misc/Listen.Mod
@@ -0,0 +1,61 @@
+(*
+ Module taken from http://www.dg.bnv-bamberg.de/seiten/faecher/informat/oberon/aachen/listen.htm 
+Author: zita@pegasus.dvz.fh-aachen.de
+
+*)
+
+MODULE Listen;
+TYPE
+ Element* = POINTER TO ElementDesc;
+ ElementDesc* = RECORD END;
+ Liste* = POINTER TO ListDesc;
+ ListDesc = RECORD
+   e:    Element;
+   rest: Liste
+ END;
+
+        CompareProc=PROCEDURE(e1,e2:Element):BOOLEAN;
+
+        PROCEDURE Concat*(head: Element; tail: Liste): Liste;
+        VAR temp:Liste;
+        BEGIN
+                NEW(temp); temp.e := head; temp.rest := tail;
+                RETURN temp
+        END Concat;
+
+        PROCEDURE Head* (l:Liste):Element;
+        BEGIN
+                RETURN l.e
+        END Head;
+
+        PROCEDURE Tail* (l:Liste):Liste;
+        BEGIN
+                RETURN l.rest
+        END Tail;
+
+         PROCEDURE Append* (list: Liste; e: Element): Liste;
+        BEGIN
+          IF list = NIL THEN
+          RETURN Concat(e, NIL) ELSE
+          RETURN Concat(Head(list),Append(Tail(list),e))
+          END;
+        END Append;
+
+
+        PROCEDURE IsElement*(e:Element;l:Liste;equal:CompareProc):BOOLEAN;
+        BEGIN
+                IF l = NIL THEN RETURN FALSE
+                ELSIF equal(e,Head(l)) THEN RETURN TRUE
+                ELSE RETURN IsElement(e,Tail(l),equal)
+                END
+        END IsElement;
+
+        PROCEDURE Find*(e:Element;l:Liste;equal:CompareProc):Element;
+        BEGIN
+                IF l = NIL THEN RETURN NIL
+                ELSIF equal(e,Head(l)) THEN RETURN Head(l)
+                ELSE RETURN Find(e,Tail(l),equal)
+                END
+        END Find;
+
+END Listen.