diff --git a/build/jam/HaikuImage b/build/jam/HaikuImage
index 261cc12821..d787c9af60 100644
--- a/build/jam/HaikuImage
+++ b/build/jam/HaikuImage
@@ -63,7 +63,9 @@ BEOS_SYSTEM_LIB = libbe.so $(HAIKU_LIBSTDC++) libmedia.so libtracker.so
 	libtranslation.so libnetwork.so libdebug.so libbsd.so libmail.so
 	libtextencoding.so libz.so libfreetype.so libpng.so libmidi.so libmidi2.so
 	libdevice.so libgame.so libscreensaver.so <revisioned>libroot.so
-	$(X86_ONLY)libGL.so libfluidsynth.so libqoca.so
+	$(X86_ONLY)libGL.so libfluidsynth.so
+	# constraint solver lib
+	lib$(LAYOUT_CONSTRAINT_SOLVER).so
 ;
 BEOS_SYSTEM_SERVERS = registrar debug_server syslog_daemon media_server
 	net_server media_addon_server input_server app_server fake_app_server
diff --git a/src/kits/Jamfile b/src/kits/Jamfile
index 8e4c762c50..c18e5e210e 100644
--- a/src/kits/Jamfile
+++ b/src/kits/Jamfile
@@ -32,7 +32,7 @@ SharedLibrary libbe.so :
 	<libbe>storage_kit.o
 	<libbe>support_kit.o
 
-	libqoca.so
+	lib$(LAYOUT_CONSTRAINT_SOLVER).so
 
 	libicon.a
 	libagg.a
@@ -68,7 +68,7 @@ SharedLibrary libbe_haiku.so :
 	<libbe>storage_kit.o
 	<libbe>support_kit.o
 
-	libqoca.so
+	lib$(LAYOUT_CONSTRAINT_SOLVER).so
 
 	libicon.a
 	libagg.a
diff --git a/src/kits/interface/Jamfile b/src/kits/interface/Jamfile
index ce22f6cfd2..dd1a3878a1 100644
--- a/src/kits/interface/Jamfile
+++ b/src/kits/interface/Jamfile
@@ -28,9 +28,21 @@ SetSubDirSupportedPlatforms haiku libbe_test ;
 UsePrivateHeaders app input interface shared tracker ;
 UseLibraryHeaders icon ;
 
-# qoca headers
-SubDirSysHdrs $(SUBDIR) ;
-SubDirHdrs [ FDirName $(SUBDIR) qoca ] ;
+
+# constraint solver to use
+local constraintSolverSources = ;
+switch $(LAYOUT_CONSTRAINT_SOLVER) {
+	case qoca :
+	{
+		DEFINES += USE_QOCA_CONSTRAINT_SOLVER ;
+		constraintSolverSources = QocaConstraintSolverLayouter.cpp ;
+		SubDirSysHdrs [ FDirName $(HAIKU_TOP) src libs ] ;
+		SubDirHdrs [ FDirName $(HAIKU_TOP) src libs qoca ] ;
+	}
+	case * :
+	{
+	}
+}
 
 
 SEARCH_SOURCE += [ FDirName $(SUBDIR) textview_support ] ;
@@ -126,10 +138,9 @@ MergeObject <libbe>interface_kit.o :
 	WidthBuffer.cpp
 
 	# layouter
-	ConstraintSolverLayouter.cpp
 	Layouter.cpp
 	OneElementLayouter.cpp
 	SimpleLayouter.cpp
-;
 
-SubInclude HAIKU_TOP src kits interface qoca ;
+	$(constraintSolverSources)
+;
diff --git a/src/kits/interface/layouter/ConstraintSolverLayouter.h b/src/kits/interface/layouter/ConstraintSolverLayouter.h
index e5ab5f84db..5b97eeafd5 100644
--- a/src/kits/interface/layouter/ConstraintSolverLayouter.h
+++ b/src/kits/interface/layouter/ConstraintSolverLayouter.h
@@ -1,144 +1,18 @@
 /*
- * Copyright 2006, Haiku Inc.
- * Distributed under the terms of the MIT License.
+ * Copyright 2007, Ingo Weinhold <bonefish@cs.tu-berlin.de>.
+ * All rights reserved. Distributed under the terms of the MIT License.
  */
 #ifndef	CONSTRAINT_SOLVER_LAYOUTER_H
 #define	CONSTRAINT_SOLVER_LAYOUTER_H
 
-#include "Layouter.h"
 
-#include <List.h>
-
-class QcLinInEqSolver;
-class QcConstraint;
-class QcConstraint;
-
-namespace BPrivate {
-namespace Layout {
-
-class ConstraintSolverLayouter : public Layouter {
-public:
-								ConstraintSolverLayouter(int32 elementCount,
-									int32 spacing);
-	virtual						~ConstraintSolverLayouter();
-
-	virtual	void				AddConstraints(int32 element, int32 length,
-									float min, float max, float preferred);
-	virtual	void				SetWeight(int32 element, float weight);
-
-	virtual	float				MinSize();
-	virtual	float				MaxSize();
-	virtual	float				PreferredSize();
-
-	virtual	LayoutInfo*			CreateLayoutInfo();
-	
-	virtual	void				Layout(LayoutInfo* layoutInfo, float size);
-
-	virtual	Layouter*			CloneLayouter();
-
-private:
-			class Set;
-
-			class Variable;
-			class Constraint;
-			class MinConstraint;
-			class MaxConstraint;
-			class MinMaxEntry;
-			class MinMaxMatrix;
-			class MyLayoutInfo;
-
-			friend class Constraint;
-
-			enum {
-				MIN_CONSTRAINT = 0,
-				MAX_CONSTRAINT = 1,
-			};
+#ifdef USE_QOCA_CONSTRAINT_SOLVER
+#	include "QocaConstraintSolverLayouter.h"
+	typedef QocaConstraintSolverLayouter ConstraintSolverLayouter;
+#else
+#	include "SimpleLayouter.h"
+	typedef SimpleLayouter ConstraintSolverLayouter;
+#endif
 
 
-			void				_ValidateMinMax();
-
-			void				_AddMinConstraint(int32 first, int32 last,
-									int32 value);
-			void				_AddMaxConstraint(int32 first, int32 last,
-									int32 value);
-
-			int32				_ComputeMin();
-			int32				_ComputeMax();
-			bool				_ComputeSolution(int32 size);
-
-			bool				_FindIntegerSolution(int32 size);
-			bool				_FindIntegerSolution(const Set& nonIntVariables,
-									const BList& minConstraints,
-									const BList& maxConstraints,
-									int32 sizeDiff);
-
-			Constraint*			_CreateConstraint(int32 type, int32 first,
-									int32 last, int32 value);
-			void				_SetConstraint(int32 type,
-									Constraint** constraints,
-									int32 element, int32 value, bool restrict);
-			void				_SetConstraint(int32 type,
-									BList& constraints,
-									int32 first, int32 last, int32 value,
-									bool restrict);
-			int					_IndexOfConstraint(BList& constraints,
-									int32 first, int32 last);
-			bool				_AddSetSizeConstraint(int32 size);
-
-			void				_AddConstraints();
-			void				_AddConstraints(const BList& constraints);
-			void				_RemoveSetSizeConstraint();
-			void				_RemoveConstraints();
-			void				_RemoveConstraint(Constraint* constraint);
-			void				_GetInvolvedConstraints(
-									const BList& constraints,
-									const BList& variables,
-									BList& filteredConstraints);
-			void				_GetViolatedConstraints(
-									const BList& constraints,
-									BList& violatedConstraints);
-			void				_FilterVariablesByMaxConstraints(
-									const BList& variables,
-									const BList& constraints,
-									Set& filteredVars);
-
-	static	int					_CompareVariables(const void* a, const void* b);
-	static	int					_CompareConstraintsByLength(const void* a,
-									const void* b);
-	static	int					_CompareConstraintsBySatisfactionDistance(
-									const void* a, const void* b);
-
-private:
-			int32				fElementCount;
-			float*				fWeights;
-	
-			Constraint**		fBasicMinConstraints;
-			Constraint**		fBasicMaxConstraints;
-
-			BList				fComplexMinConstraints;
-			BList				fComplexMaxConstraints;
-
-			Variable*			fVariables;
-			Variable*			fSizeVariable;
-
-			QcLinInEqSolver*	fSolver;
-			QcConstraint*		fSizeSumConstraint;
-			QcConstraint*		fSetSizeConstraint;
-
-			bool				fConstraintsAdded;
-			bool				fSetSizeConstraintAdded;
-
-			int32				fSpacing;
-			int32				fMin;
-			int32				fMax;
-			bool				fMinMaxValid;
-
-			MyLayoutInfo*		fLayoutInfo;
-};
-
-}	// namespace Layout
-}	// namespace BPrivate
-
-using BPrivate::Layout::ConstraintSolverLayouter;
-
-#endif	// CONSTRAINT_SOLVER_LAYOUTER_H
+#endif	//	CONSTRAINT_SOLVER_LAYOUTER_H
diff --git a/src/kits/interface/layouter/ConstraintSolverLayouter.cpp b/src/kits/interface/layouter/QocaConstraintSolverLayouter.cpp
similarity index 90%
rename from src/kits/interface/layouter/ConstraintSolverLayouter.cpp
rename to src/kits/interface/layouter/QocaConstraintSolverLayouter.cpp
index 2360cc4ff8..34b878d4f2 100644
--- a/src/kits/interface/layouter/ConstraintSolverLayouter.cpp
+++ b/src/kits/interface/layouter/QocaConstraintSolverLayouter.cpp
@@ -1,9 +1,9 @@
 /*
- * Copyright 2006, Ingo Weinhold <bonefish@cs.tu-berlin.de>.
+ * Copyright 2006-2007, Ingo Weinhold <bonefish@cs.tu-berlin.de>.
  * All rights reserved. Distributed under the terms of the MIT License.
  */
 
-#include "ConstraintSolverLayouter.h"
+#include "QocaConstraintSolverLayouter.h"
 
 #include <cmath>
 #include <cstring>
@@ -29,7 +29,6 @@
 #include <qoca/QcLinPoly.hh>
 
 
-
 // This monster is a Layouter implementation similar to SimpleLayouter with
 // the difference that it accepts min/max constraints over several elements,
 // i.e. not only constraints of the form x_i <=/>= a, but also of the form
@@ -66,7 +65,7 @@
 
 
 // Set
-class ConstraintSolverLayouter::Set {
+class QocaConstraintSolverLayouter::Set {
 public:
 	Set()
 		: fElements()
@@ -140,7 +139,7 @@ private:
 
 
 // Variable
-class ConstraintSolverLayouter::Variable {
+class QocaConstraintSolverLayouter::Variable {
 public:
 	Variable()
 		: fQocaVariable(NULL),
@@ -213,9 +212,9 @@ private:
 
 
 // Constraint
-class ConstraintSolverLayouter::Constraint {
+class QocaConstraintSolverLayouter::Constraint {
 public:
-	Constraint(ConstraintSolverLayouter* layouter,
+	Constraint(QocaConstraintSolverLayouter* layouter,
 			int32 first, int32 last, int32 value)
 		: fLayouter(layouter),
 		  fFirst(first),
@@ -241,7 +240,8 @@ public:
 		delete fQocaConstraint;
 	}
 
-	virtual Constraint* CloneConstraint(ConstraintSolverLayouter* layouter) = 0;
+	virtual Constraint* CloneConstraint(
+		QocaConstraintSolverLayouter* layouter) = 0;
 	
 	int32 First() const
 	{
@@ -338,7 +338,7 @@ public:
 
 
 protected:
-	ConstraintSolverLayouter* fLayouter;
+	QocaConstraintSolverLayouter* fLayouter;
 
 	int32			fFirst;
 	int32			fLast;
@@ -357,16 +357,16 @@ private:
 
 
 // MinConstraint
-class ConstraintSolverLayouter::MinConstraint : public Constraint {
+class QocaConstraintSolverLayouter::MinConstraint : public Constraint {
 public:
-	MinConstraint(ConstraintSolverLayouter* layouter, int32 first, int32 last,
-		int32 value)
+	MinConstraint(QocaConstraintSolverLayouter* layouter, int32 first,
+			int32 last, int32 value)
 		: Constraint(layouter, first, last, value)
 	{
 		SetOriginalValue(value);
 	}
 
-	virtual Constraint* CloneConstraint(ConstraintSolverLayouter* layouter)
+	virtual Constraint* CloneConstraint(QocaConstraintSolverLayouter* layouter)
 	{
 		Constraint* constraint = new MinConstraint(layouter, fFirst, fLast,
 			fOriginalValue);
@@ -398,16 +398,16 @@ public:
 
 
 // MaxConstraint
-class ConstraintSolverLayouter::MaxConstraint : public Constraint {
+class QocaConstraintSolverLayouter::MaxConstraint : public Constraint {
 public:
-	MaxConstraint(ConstraintSolverLayouter* layouter, int32 first, int32 last,
-		int32 value)
+	MaxConstraint(QocaConstraintSolverLayouter* layouter, int32 first,
+			int32 last, int32 value)
 		: Constraint(layouter, first, last, value)
 	{
 		SetOriginalValue(value);
 	}
 
-	virtual Constraint* CloneConstraint(ConstraintSolverLayouter* layouter)
+	virtual Constraint* CloneConstraint(QocaConstraintSolverLayouter* layouter)
 	{
 		Constraint* constraint = new MaxConstraint(layouter, fFirst, fLast,
 			fOriginalValue);
@@ -439,7 +439,7 @@ public:
 
 
 // MinMaxEntry
-class ConstraintSolverLayouter::MinMaxEntry {
+class QocaConstraintSolverLayouter::MinMaxEntry {
 public:
 	Constraint*	minConstraint;
 	Constraint*	maxConstraint;
@@ -473,7 +473,7 @@ public:
 
 
 // MinMaxMatrix
-class ConstraintSolverLayouter::MinMaxMatrix {
+class QocaConstraintSolverLayouter::MinMaxMatrix {
 public:
 	MinMaxMatrix(int size)
 		: fSize(size),
@@ -500,7 +500,7 @@ private:
 
 
 // MyLayoutInfo
-class ConstraintSolverLayouter::MyLayoutInfo : public LayoutInfo {
+class QocaConstraintSolverLayouter::MyLayoutInfo : public LayoutInfo {
 public:
 	MyLayoutInfo(int32 elementCount)
 		: fCount(elementCount)
@@ -533,7 +533,7 @@ public:
 
 	void Dump()
 	{
-		printf("ConstraintSolverLayouter::MyLayoutInfo(): %ld elements:\n",
+		printf("QocaConstraintSolverLayouter::MyLayoutInfo(): %ld elements:\n",
 			fCount);
 		for (int32 i = 0; i < fCount; i++) {
 			printf("  %2ld: location: %4ld, size: %4ld\n", i, fLocations[i],
@@ -548,11 +548,11 @@ public:
 };
 
 
-// #pragma mark - ConstraintSolverLayouter
+// #pragma mark - QocaConstraintSolverLayouter
 
 
 // constructor
-ConstraintSolverLayouter::ConstraintSolverLayouter(int32 elementCount,
+QocaConstraintSolverLayouter::QocaConstraintSolverLayouter(int32 elementCount,
 	int32 spacing)
 	: fElementCount(elementCount),
 	  fWeights(NULL),
@@ -612,7 +612,7 @@ ConstraintSolverLayouter::ConstraintSolverLayouter(int32 elementCount,
 }
 
 // destructor
-ConstraintSolverLayouter::~ConstraintSolverLayouter()
+QocaConstraintSolverLayouter::~QocaConstraintSolverLayouter()
 {
 	delete fSetSizeConstraint;
 	delete fSizeSumConstraint;
@@ -627,7 +627,7 @@ ConstraintSolverLayouter::~ConstraintSolverLayouter()
 
 // AddConstraints
 void
-ConstraintSolverLayouter::AddConstraints(int32 element, int32 length,
+QocaConstraintSolverLayouter::AddConstraints(int32 element, int32 length,
 	float _min, float _max, float _preferred)
 {
 	if (length <= 0 || length > fElementCount)
@@ -649,7 +649,7 @@ ConstraintSolverLayouter::AddConstraints(int32 element, int32 length,
 
 // SetWeight
 void
-ConstraintSolverLayouter::SetWeight(int32 element, float weight)
+QocaConstraintSolverLayouter::SetWeight(int32 element, float weight)
 {
 	if (element < 0 || element >= fElementCount)
 		return;
@@ -659,7 +659,7 @@ ConstraintSolverLayouter::SetWeight(int32 element, float weight)
 
 // MinSize
 float
-ConstraintSolverLayouter::MinSize()
+QocaConstraintSolverLayouter::MinSize()
 {
 	_ValidateMinMax();
 	return fMin - 1;
@@ -667,7 +667,7 @@ ConstraintSolverLayouter::MinSize()
 
 // MaxSize
 float
-ConstraintSolverLayouter::MaxSize()
+QocaConstraintSolverLayouter::MaxSize()
 {
 	_ValidateMinMax();
 	return fMax - 1;
@@ -675,7 +675,7 @@ ConstraintSolverLayouter::MaxSize()
 
 // PreferredSize
 float
-ConstraintSolverLayouter::PreferredSize()
+QocaConstraintSolverLayouter::PreferredSize()
 {
 	_ValidateMinMax();
 	return fMin - 1;
@@ -683,16 +683,16 @@ ConstraintSolverLayouter::PreferredSize()
 
 // CreateLayoutInfo
 LayoutInfo*
-ConstraintSolverLayouter::CreateLayoutInfo()
+QocaConstraintSolverLayouter::CreateLayoutInfo()
 {
 	return new MyLayoutInfo(fElementCount);
 }
 
 // Layout
 void
-ConstraintSolverLayouter::Layout(LayoutInfo* layoutInfo, float _size)
+QocaConstraintSolverLayouter::Layout(LayoutInfo* layoutInfo, float _size)
 {
-//printf("ConstraintSolverLayouter::Layout(%p, %.1f): min: %ld, max: %ld\n",
+//printf("QocaConstraintSolverLayouter::Layout(%p, %.1f): min: %ld, max: %ld\n",
 //layoutInfo, _size, fMin, fMax);
 	int32 size = (int32)_size + 1;
 
@@ -710,7 +710,7 @@ ConstraintSolverLayouter::Layout(LayoutInfo* layoutInfo, float _size)
 	size -= additionalSpace;
 	int32 spacing = (fElementCount - 1) * fSpacing;
 	if (!_ComputeSolution(size - spacing)) {
-		ERROR_MESSAGE("ConstraintSolverLayouter::Layout(): no solution\n");
+		ERROR_MESSAGE("QocaConstraintSolverLayouter::Layout(): no solution\n");
 		// no solution
 		return;
 	}
@@ -750,10 +750,10 @@ ConstraintSolverLayouter::Layout(LayoutInfo* layoutInfo, float _size)
 
 // CloneLayouter
 Layouter*
-ConstraintSolverLayouter::CloneLayouter()
+QocaConstraintSolverLayouter::CloneLayouter()
 {
-	ConstraintSolverLayouter* layouter
-		= new ConstraintSolverLayouter(fElementCount, fSpacing);
+	QocaConstraintSolverLayouter* layouter
+		= new QocaConstraintSolverLayouter(fElementCount, fSpacing);
 
 	memcpy(layouter->fWeights, fWeights, sizeof(float) * fElementCount);
 
@@ -790,7 +790,7 @@ ConstraintSolverLayouter::CloneLayouter()
 
 // _ValidateMinMax
 void
-ConstraintSolverLayouter::_ValidateMinMax()
+QocaConstraintSolverLayouter::_ValidateMinMax()
 {
 	if (fMinMaxValid)
 		return;
@@ -809,7 +809,7 @@ ConstraintSolverLayouter::_ValidateMinMax()
 
 // _AddMinConstraint
 void
-ConstraintSolverLayouter::_AddMinConstraint(int32 first, int32 last,
+QocaConstraintSolverLayouter::_AddMinConstraint(int32 first, int32 last,
 	int32 value)
 {
 	if (first == last) {
@@ -823,7 +823,7 @@ ConstraintSolverLayouter::_AddMinConstraint(int32 first, int32 last,
 
 // _AddMaxConstraint
 void
-ConstraintSolverLayouter::_AddMaxConstraint(int32 first, int32 last,
+QocaConstraintSolverLayouter::_AddMaxConstraint(int32 first, int32 last,
 	int32 value)
 {
 	if (first == last) {
@@ -837,7 +837,7 @@ ConstraintSolverLayouter::_AddMaxConstraint(int32 first, int32 last,
 
 // _ComputeMin
 int32
-ConstraintSolverLayouter::_ComputeMin()
+QocaConstraintSolverLayouter::_ComputeMin()
 {
 	_RemoveSetSizeConstraint();
 	_AddConstraints();
@@ -855,7 +855,7 @@ ConstraintSolverLayouter::_ComputeMin()
 	bool success = _FindIntegerSolution(size);
 	if (!success) {
 		ERROR_MESSAGE(
-			"ConstraintSolverLayouter::_ComputeMin(): no int solution\n");
+			"QocaConstraintSolverLayouter::_ComputeMin(): no int solution\n");
 		return 0;
 	}
 
@@ -864,7 +864,7 @@ ConstraintSolverLayouter::_ComputeMin()
 
 // _ComputeMax
 int32
-ConstraintSolverLayouter::_ComputeMax()
+QocaConstraintSolverLayouter::_ComputeMax()
 {
 	_RemoveSetSizeConstraint();
 	_AddConstraints();
@@ -888,7 +888,7 @@ ConstraintSolverLayouter::_ComputeMax()
 	bool success = _FindIntegerSolution(size);
 	if (!success) {
 		ERROR_MESSAGE(
-			"ConstraintSolverLayouter::_ComputeMax(): no int solution\n");
+			"QocaConstraintSolverLayouter::_ComputeMax(): no int solution\n");
 		return B_SIZE_UNLIMITED;
 	}
 
@@ -897,9 +897,9 @@ ConstraintSolverLayouter::_ComputeMax()
 
 // _ComputeSolution
 bool
-ConstraintSolverLayouter::_ComputeSolution(int32 size)
+QocaConstraintSolverLayouter::_ComputeSolution(int32 size)
 {
-//printf("ConstraintSolverLayouter::_ComputeSolution(%ld)\n", size);
+//printf("QocaConstraintSolverLayouter::_ComputeSolution(%ld)\n", size);
 	_RemoveSetSizeConstraint();
 	_AddConstraints();
 
@@ -913,7 +913,7 @@ ConstraintSolverLayouter::_ComputeSolution(int32 size)
 
 	if (!_AddSetSizeConstraint(size)) {
 		// Ugh! Contradictory!
-		ERROR_MESSAGE("ConstraintSolverLayouter::_ComputeSolution(): "
+		ERROR_MESSAGE("QocaConstraintSolverLayouter::_ComputeSolution(): "
 			"contradictory CSP\n");
 		return false;
 	}
@@ -922,7 +922,7 @@ ConstraintSolverLayouter::_ComputeSolution(int32 size)
 	fSolver->Solve();
 
 	if (!_FindIntegerSolution(size)) {
-		ERROR_MESSAGE("ConstraintSolverLayouter::_ComputeSolution(): "
+		ERROR_MESSAGE("QocaConstraintSolverLayouter::_ComputeSolution(): "
 			"no int solution\n");
 		return false;
 	}
@@ -932,9 +932,9 @@ ConstraintSolverLayouter::_ComputeSolution(int32 size)
 
 // _FindIntegerSolution
 bool
-ConstraintSolverLayouter::_FindIntegerSolution(int32 size)
+QocaConstraintSolverLayouter::_FindIntegerSolution(int32 size)
 {
-//printf("ConstraintSolverLayouter::_FindIntegerSolution(%ld)\n", size);
+//printf("QocaConstraintSolverLayouter::_FindIntegerSolution(%ld)\n", size);
 //printf("  solution:\n");
 	// check whether there are non-integer variable values
 	Set nonIntVariables;
@@ -981,13 +981,13 @@ ConstraintSolverLayouter::_FindIntegerSolution(int32 size)
 		return true;
 	
 	if (sum > size) {
-		ERROR_MESSAGE("ConstraintSolverLayouter::_FindIntegerSolution(): "
+		ERROR_MESSAGE("QocaConstraintSolverLayouter::_FindIntegerSolution(): "
 			"computed size %ld, but element sum is %ld\n", size, sum);
 		return false;
 	}
 
 	if (nonIntVariables.IsEmpty()) {
-		ERROR_MESSAGE("ConstraintSolverLayouter::_FindIntegerSolution(): "
+		ERROR_MESSAGE("QocaConstraintSolverLayouter::_FindIntegerSolution(): "
 			"computed size %ld, element sum is %ld, but we have no "
 			"non-integer variables\n", size, sum);
 		return false;
@@ -1014,7 +1014,7 @@ ConstraintSolverLayouter::_FindIntegerSolution(int32 size)
 
 // _FindIntegerSolution
 bool
-ConstraintSolverLayouter::_FindIntegerSolution(const Set& _nonIntVariables,
+QocaConstraintSolverLayouter::_FindIntegerSolution(const Set& _nonIntVariables,
 	const BList& _minConstraints, const BList& _maxConstraints, int32 sizeDiff)
 {
 	// We get the variables that had a non-integer value, and lists of minimum
@@ -1108,14 +1108,14 @@ ConstraintSolverLayouter::_FindIntegerSolution(const Set& _nonIntVariables,
 	}
 
 	// if we are here, we didn't find a solution
-	ERROR_MESSAGE("ConstraintSolverLayouter::_FindIntegerSolution(): "
+	ERROR_MESSAGE("QocaConstraintSolverLayouter::_FindIntegerSolution(): "
 		"found no int solution\n");
 	return false;
 }
 
 // _CreateConstraint
-ConstraintSolverLayouter::Constraint*
-ConstraintSolverLayouter::_CreateConstraint(int32 type, int32 first,
+QocaConstraintSolverLayouter::Constraint*
+QocaConstraintSolverLayouter::_CreateConstraint(int32 type, int32 first,
 	int32 last, int32 value)
 {
 	switch (type) {
@@ -1131,8 +1131,8 @@ ConstraintSolverLayouter::_CreateConstraint(int32 type, int32 first,
 
 // _SetConstraint
 void
-ConstraintSolverLayouter::_SetConstraint(int32 type, Constraint** constraints,
-	int32 element, int32 value, bool restrict)
+QocaConstraintSolverLayouter::_SetConstraint(int32 type,
+	Constraint** constraints, int32 element, int32 value, bool restrict)
 {
 	if (element < 0 || element >= fElementCount)
 		return;
@@ -1156,7 +1156,7 @@ ConstraintSolverLayouter::_SetConstraint(int32 type, Constraint** constraints,
 
 // _SetConstraint
 void
-ConstraintSolverLayouter::_SetConstraint(int32 type, BList& constraints,
+QocaConstraintSolverLayouter::_SetConstraint(int32 type, BList& constraints,
 	int32 first, int32 last, int32 value, bool restrict)
 {
 	if (first < 0 || first > last || last >= fElementCount)
@@ -1185,8 +1185,8 @@ ConstraintSolverLayouter::_SetConstraint(int32 type, BList& constraints,
 
 // _IndexOfConstraint
 int
-ConstraintSolverLayouter::_IndexOfConstraint(BList& constraints, int32 first,
-	int32 last)
+QocaConstraintSolverLayouter::_IndexOfConstraint(BList& constraints,
+	int32 first, int32 last)
 {
 	int32 count = constraints.CountItems();
 	for (int32 i = 0; i < count; i++) {
@@ -1200,7 +1200,7 @@ ConstraintSolverLayouter::_IndexOfConstraint(BList& constraints, int32 first,
 
 // _AddSetSizeConstraint
 bool
-ConstraintSolverLayouter::_AddSetSizeConstraint(int32 size)
+QocaConstraintSolverLayouter::_AddSetSizeConstraint(int32 size)
 {
 	if (fSetSizeConstraintAdded) {
 		if (fSetSizeConstraint->RHS() == size)
@@ -1220,7 +1220,7 @@ ConstraintSolverLayouter::_AddSetSizeConstraint(int32 size)
 
 // _AddConstraints
 void
-ConstraintSolverLayouter::_AddConstraints()
+QocaConstraintSolverLayouter::_AddConstraints()
 {
 	if (fConstraintsAdded)
 		return;
@@ -1441,7 +1441,7 @@ ConstraintSolverLayouter::_AddConstraints()
 
 // _AddConstraints
 void
-ConstraintSolverLayouter::_AddConstraints(const BList& constraints)
+QocaConstraintSolverLayouter::_AddConstraints(const BList& constraints)
 {
 	int32 count = constraints.CountItems();
 	for (int32 i = 0; i < count; i++) {
@@ -1507,7 +1507,7 @@ ConstraintSolverLayouter::_AddConstraints(const BList& constraints)
 
 // _RemoveSetSizeConstraint
 void
-ConstraintSolverLayouter::_RemoveSetSizeConstraint()
+QocaConstraintSolverLayouter::_RemoveSetSizeConstraint()
 {
 	if (fSetSizeConstraintAdded) {
 		fSolver->RemoveConstraint(*fSetSizeConstraint);
@@ -1517,7 +1517,7 @@ ConstraintSolverLayouter::_RemoveSetSizeConstraint()
 
 // _RemoveConstraints
 void
-ConstraintSolverLayouter::_RemoveConstraints()
+QocaConstraintSolverLayouter::_RemoveConstraints()
 {
 	if (!fConstraintsAdded)
 		return;
@@ -1547,7 +1547,7 @@ ConstraintSolverLayouter::_RemoveConstraints()
 
 // _RemoveConstraint
 void
-ConstraintSolverLayouter::_RemoveConstraint(Constraint* constraint)
+QocaConstraintSolverLayouter::_RemoveConstraint(Constraint* constraint)
 {
 	if (constraint != NULL && constraint->IsAdded()) {
 		fSolver->RemoveConstraint(*constraint->QocaConstraint());
@@ -1557,7 +1557,7 @@ ConstraintSolverLayouter::_RemoveConstraint(Constraint* constraint)
 
 // _GetInvolvedConstraints
 void
-ConstraintSolverLayouter::_GetInvolvedConstraints(const BList& constraints,
+QocaConstraintSolverLayouter::_GetInvolvedConstraints(const BList& constraints,
 	const BList& variables, BList& filteredConstraints)
 {
 	filteredConstraints.MakeEmpty();
@@ -1591,7 +1591,7 @@ ConstraintSolverLayouter::_GetInvolvedConstraints(const BList& constraints,
 
 // _GetViolatedConstraints
 void
-ConstraintSolverLayouter::_GetViolatedConstraints(const BList& constraints,
+QocaConstraintSolverLayouter::_GetViolatedConstraints(const BList& constraints,
 	BList& violatedConstraints)
 {
 	violatedConstraints.MakeEmpty();
@@ -1615,7 +1615,7 @@ ConstraintSolverLayouter::_GetViolatedConstraints(const BList& constraints,
 
 // _FilterVariablesByMaxConstraints
 void
-ConstraintSolverLayouter::_FilterVariablesByMaxConstraints(
+QocaConstraintSolverLayouter::_FilterVariablesByMaxConstraints(
 	const BList& variables, const BList& constraints, Set& filteredVars)
 {
 	filteredVars.MakeEmpty();
@@ -1642,7 +1642,7 @@ ConstraintSolverLayouter::_FilterVariablesByMaxConstraints(
 
 // _CompareVariables
 int
-ConstraintSolverLayouter::_CompareVariables(const void* _a, const void* _b)
+QocaConstraintSolverLayouter::_CompareVariables(const void* _a, const void* _b)
 {
 	// compare by distance of the float solution to the integer solution
 	Variable* a = *(Variable**)_a;
@@ -1658,7 +1658,7 @@ ConstraintSolverLayouter::_CompareVariables(const void* _a, const void* _b)
 
 // _CompareConstraints
 int
-ConstraintSolverLayouter::_CompareConstraintsByLength(const void* _a,
+QocaConstraintSolverLayouter::_CompareConstraintsByLength(const void* _a,
 	const void* _b)
 {
 	// compare by number of involved variables
@@ -1670,7 +1670,7 @@ ConstraintSolverLayouter::_CompareConstraintsByLength(const void* _a,
 
 // _CompareConstraints
 int
-ConstraintSolverLayouter::_CompareConstraintsBySatisfactionDistance(
+QocaConstraintSolverLayouter::_CompareConstraintsBySatisfactionDistance(
 	const void* _a, const void* _b)
 {
 	// compare by number of involved variables
diff --git a/src/kits/interface/layouter/QocaConstraintSolverLayouter.h b/src/kits/interface/layouter/QocaConstraintSolverLayouter.h
new file mode 100644
index 0000000000..572394d603
--- /dev/null
+++ b/src/kits/interface/layouter/QocaConstraintSolverLayouter.h
@@ -0,0 +1,144 @@
+/*
+ * Copyright 2006-2007, Ingo Weinhold <bonefish@cs.tu-berlin.de>.
+ * All rights reserved. Distributed under the terms of the MIT License.
+ */
+#ifndef	QOCA_CONSTRAINT_SOLVER_LAYOUTER_H
+#define	QOCA_CONSTRAINT_SOLVER_LAYOUTER_H
+
+#include "Layouter.h"
+
+#include <List.h>
+
+class QcLinInEqSolver;
+class QcConstraint;
+class QcConstraint;
+
+namespace BPrivate {
+namespace Layout {
+
+class QocaConstraintSolverLayouter : public Layouter {
+public:
+								QocaConstraintSolverLayouter(int32 elementCount,
+									int32 spacing);
+	virtual						~QocaConstraintSolverLayouter();
+
+	virtual	void				AddConstraints(int32 element, int32 length,
+									float min, float max, float preferred);
+	virtual	void				SetWeight(int32 element, float weight);
+
+	virtual	float				MinSize();
+	virtual	float				MaxSize();
+	virtual	float				PreferredSize();
+
+	virtual	LayoutInfo*			CreateLayoutInfo();
+	
+	virtual	void				Layout(LayoutInfo* layoutInfo, float size);
+
+	virtual	Layouter*			CloneLayouter();
+
+private:
+			class Set;
+
+			class Variable;
+			class Constraint;
+			class MinConstraint;
+			class MaxConstraint;
+			class MinMaxEntry;
+			class MinMaxMatrix;
+			class MyLayoutInfo;
+
+			friend class Constraint;
+
+			enum {
+				MIN_CONSTRAINT = 0,
+				MAX_CONSTRAINT = 1,
+			};
+
+
+			void				_ValidateMinMax();
+
+			void				_AddMinConstraint(int32 first, int32 last,
+									int32 value);
+			void				_AddMaxConstraint(int32 first, int32 last,
+									int32 value);
+
+			int32				_ComputeMin();
+			int32				_ComputeMax();
+			bool				_ComputeSolution(int32 size);
+
+			bool				_FindIntegerSolution(int32 size);
+			bool				_FindIntegerSolution(const Set& nonIntVariables,
+									const BList& minConstraints,
+									const BList& maxConstraints,
+									int32 sizeDiff);
+
+			Constraint*			_CreateConstraint(int32 type, int32 first,
+									int32 last, int32 value);
+			void				_SetConstraint(int32 type,
+									Constraint** constraints,
+									int32 element, int32 value, bool restrict);
+			void				_SetConstraint(int32 type,
+									BList& constraints,
+									int32 first, int32 last, int32 value,
+									bool restrict);
+			int					_IndexOfConstraint(BList& constraints,
+									int32 first, int32 last);
+			bool				_AddSetSizeConstraint(int32 size);
+
+			void				_AddConstraints();
+			void				_AddConstraints(const BList& constraints);
+			void				_RemoveSetSizeConstraint();
+			void				_RemoveConstraints();
+			void				_RemoveConstraint(Constraint* constraint);
+			void				_GetInvolvedConstraints(
+									const BList& constraints,
+									const BList& variables,
+									BList& filteredConstraints);
+			void				_GetViolatedConstraints(
+									const BList& constraints,
+									BList& violatedConstraints);
+			void				_FilterVariablesByMaxConstraints(
+									const BList& variables,
+									const BList& constraints,
+									Set& filteredVars);
+
+	static	int					_CompareVariables(const void* a, const void* b);
+	static	int					_CompareConstraintsByLength(const void* a,
+									const void* b);
+	static	int					_CompareConstraintsBySatisfactionDistance(
+									const void* a, const void* b);
+
+private:
+			int32				fElementCount;
+			float*				fWeights;
+	
+			Constraint**		fBasicMinConstraints;
+			Constraint**		fBasicMaxConstraints;
+
+			BList				fComplexMinConstraints;
+			BList				fComplexMaxConstraints;
+
+			Variable*			fVariables;
+			Variable*			fSizeVariable;
+
+			QcLinInEqSolver*	fSolver;
+			QcConstraint*		fSizeSumConstraint;
+			QcConstraint*		fSetSizeConstraint;
+
+			bool				fConstraintsAdded;
+			bool				fSetSizeConstraintAdded;
+
+			int32				fSpacing;
+			int32				fMin;
+			int32				fMax;
+			bool				fMinMaxValid;
+
+			MyLayoutInfo*		fLayoutInfo;
+};
+
+}	// namespace Layout
+}	// namespace BPrivate
+
+using BPrivate::Layout::QocaConstraintSolverLayouter;
+
+#endif	// QOCA_CONSTRAINT_SOLVER_LAYOUTER_H
diff --git a/src/libs/Jamfile b/src/libs/Jamfile
index 79db6a99cf..8e01fe211f 100644
--- a/src/libs/Jamfile
+++ b/src/libs/Jamfile
@@ -13,6 +13,7 @@ SubInclude HAIKU_TOP src libs libtelnet ;
 SubInclude HAIKU_TOP src libs ncurses ;
 SubInclude HAIKU_TOP src libs pdflib ;
 SubInclude HAIKU_TOP src libs png ;
+SubInclude HAIKU_TOP src libs qoca ;
 SubInclude HAIKU_TOP src libs stdc++ ;
 SubInclude HAIKU_TOP src libs termcap ;
 SubInclude HAIKU_TOP src libs usb ;
diff --git a/src/kits/interface/qoca/ChangeLog b/src/libs/qoca/ChangeLog
similarity index 100%
rename from src/kits/interface/qoca/ChangeLog
rename to src/libs/qoca/ChangeLog
diff --git a/src/kits/interface/qoca/Jamfile b/src/libs/qoca/Jamfile
similarity index 96%
rename from src/kits/interface/qoca/Jamfile
rename to src/libs/qoca/Jamfile
index 3b704a68f5..52fbd478a3 100644
--- a/src/kits/interface/qoca/Jamfile
+++ b/src/libs/qoca/Jamfile
@@ -1,4 +1,4 @@
-SubDir HAIKU_TOP src kits interface qoca ;
+SubDir HAIKU_TOP src libs qoca ;
 
 # Don't compile qoca with debugging. Debug/non-debug versions are
 # incompatible.
diff --git a/src/kits/interface/qoca/KeyIterator.hh b/src/libs/qoca/KeyIterator.hh
similarity index 100%
rename from src/kits/interface/qoca/KeyIterator.hh
rename to src/libs/qoca/KeyIterator.hh
diff --git a/src/kits/interface/qoca/Makefile.am b/src/libs/qoca/Makefile.am
similarity index 100%
rename from src/kits/interface/qoca/Makefile.am
rename to src/libs/qoca/Makefile.am
diff --git a/src/kits/interface/qoca/Makefile.am.m4 b/src/libs/qoca/Makefile.am.m4
similarity index 100%
rename from src/kits/interface/qoca/Makefile.am.m4
rename to src/libs/qoca/Makefile.am.m4
diff --git a/src/kits/interface/qoca/Makefile.in b/src/libs/qoca/Makefile.in
similarity index 100%
rename from src/kits/interface/qoca/Makefile.in
rename to src/libs/qoca/Makefile.in
diff --git a/src/kits/interface/qoca/QcASetSolver.H b/src/libs/qoca/QcASetSolver.H
similarity index 100%
rename from src/kits/interface/qoca/QcASetSolver.H
rename to src/libs/qoca/QcASetSolver.H
diff --git a/src/kits/interface/qoca/QcASetSolver.cc b/src/libs/qoca/QcASetSolver.cc
similarity index 100%
rename from src/kits/interface/qoca/QcASetSolver.cc
rename to src/libs/qoca/QcASetSolver.cc
diff --git a/src/kits/interface/qoca/QcASetSolver.ch b/src/libs/qoca/QcASetSolver.ch
similarity index 100%
rename from src/kits/interface/qoca/QcASetSolver.ch
rename to src/libs/qoca/QcASetSolver.ch
diff --git a/src/kits/interface/qoca/QcASetSolver.hh b/src/libs/qoca/QcASetSolver.hh
similarity index 100%
rename from src/kits/interface/qoca/QcASetSolver.hh
rename to src/libs/qoca/QcASetSolver.hh
diff --git a/src/kits/interface/qoca/QcAliasedBiMap.H b/src/libs/qoca/QcAliasedBiMap.H
similarity index 100%
rename from src/kits/interface/qoca/QcAliasedBiMap.H
rename to src/libs/qoca/QcAliasedBiMap.H
diff --git a/src/kits/interface/qoca/QcAliasedBiMap.ch b/src/libs/qoca/QcAliasedBiMap.ch
similarity index 100%
rename from src/kits/interface/qoca/QcAliasedBiMap.ch
rename to src/libs/qoca/QcAliasedBiMap.ch
diff --git a/src/kits/interface/qoca/QcAliasedBiMap.hh b/src/libs/qoca/QcAliasedBiMap.hh
similarity index 100%
rename from src/kits/interface/qoca/QcAliasedBiMap.hh
rename to src/libs/qoca/QcAliasedBiMap.hh
diff --git a/src/kits/interface/qoca/QcBasicVarIndexIterator.hh b/src/libs/qoca/QcBasicVarIndexIterator.hh
similarity index 100%
rename from src/kits/interface/qoca/QcBasicVarIndexIterator.hh
rename to src/libs/qoca/QcBasicVarIndexIterator.hh
diff --git a/src/kits/interface/qoca/QcBasicnessVarIndexIterator.hh b/src/libs/qoca/QcBasicnessVarIndexIterator.hh
similarity index 100%
rename from src/kits/interface/qoca/QcBasicnessVarIndexIterator.hh
rename to src/libs/qoca/QcBasicnessVarIndexIterator.hh
diff --git a/src/kits/interface/qoca/QcBiMap.H b/src/libs/qoca/QcBiMap.H
similarity index 100%
rename from src/kits/interface/qoca/QcBiMap.H
rename to src/libs/qoca/QcBiMap.H
diff --git a/src/kits/interface/qoca/QcBiMap.ch b/src/libs/qoca/QcBiMap.ch
similarity index 100%
rename from src/kits/interface/qoca/QcBiMap.ch
rename to src/libs/qoca/QcBiMap.ch
diff --git a/src/kits/interface/qoca/QcBiMap.hh b/src/libs/qoca/QcBiMap.hh
similarity index 100%
rename from src/kits/interface/qoca/QcBiMap.hh
rename to src/libs/qoca/QcBiMap.hh
diff --git a/src/kits/interface/qoca/QcBiMapNotifier.hh b/src/libs/qoca/QcBiMapNotifier.hh
similarity index 100%
rename from src/kits/interface/qoca/QcBiMapNotifier.hh
rename to src/libs/qoca/QcBiMapNotifier.hh
diff --git a/src/kits/interface/qoca/QcCassConstraint.hh b/src/libs/qoca/QcCassConstraint.hh
similarity index 100%
rename from src/kits/interface/qoca/QcCassConstraint.hh
rename to src/libs/qoca/QcCassConstraint.hh
diff --git a/src/kits/interface/qoca/QcCassSolver.cc b/src/libs/qoca/QcCassSolver.cc
similarity index 100%
rename from src/kits/interface/qoca/QcCassSolver.cc
rename to src/libs/qoca/QcCassSolver.cc
diff --git a/src/kits/interface/qoca/QcCassSolver.hh b/src/libs/qoca/QcCassSolver.hh
similarity index 100%
rename from src/kits/interface/qoca/QcCassSolver.hh
rename to src/libs/qoca/QcCassSolver.hh
diff --git a/src/kits/interface/qoca/QcCompPivotSystem.cc b/src/libs/qoca/QcCompPivotSystem.cc
similarity index 100%
rename from src/kits/interface/qoca/QcCompPivotSystem.cc
rename to src/libs/qoca/QcCompPivotSystem.cc
diff --git a/src/kits/interface/qoca/QcCompPivotSystem.hh b/src/libs/qoca/QcCompPivotSystem.hh
similarity index 100%
rename from src/kits/interface/qoca/QcCompPivotSystem.hh
rename to src/libs/qoca/QcCompPivotSystem.hh
diff --git a/src/kits/interface/qoca/QcCompPivotTableau.cc b/src/libs/qoca/QcCompPivotTableau.cc
similarity index 100%
rename from src/kits/interface/qoca/QcCompPivotTableau.cc
rename to src/libs/qoca/QcCompPivotTableau.cc
diff --git a/src/kits/interface/qoca/QcCompPivotTableau.hh b/src/libs/qoca/QcCompPivotTableau.hh
similarity index 100%
rename from src/kits/interface/qoca/QcCompPivotTableau.hh
rename to src/libs/qoca/QcCompPivotTableau.hh
diff --git a/src/kits/interface/qoca/QcConstraint.hh b/src/libs/qoca/QcConstraint.hh
similarity index 100%
rename from src/kits/interface/qoca/QcConstraint.hh
rename to src/libs/qoca/QcConstraint.hh
diff --git a/src/kits/interface/qoca/QcConstraintBiMap.hh b/src/libs/qoca/QcConstraintBiMap.hh
similarity index 100%
rename from src/kits/interface/qoca/QcConstraintBiMap.hh
rename to src/libs/qoca/QcConstraintBiMap.hh
diff --git a/src/kits/interface/qoca/QcConstraintIndexIterator.hh b/src/libs/qoca/QcConstraintIndexIterator.hh
similarity index 100%
rename from src/kits/interface/qoca/QcConstraintIndexIterator.hh
rename to src/libs/qoca/QcConstraintIndexIterator.hh
diff --git a/src/kits/interface/qoca/QcConstraintRep.cc b/src/libs/qoca/QcConstraintRep.cc
similarity index 100%
rename from src/kits/interface/qoca/QcConstraintRep.cc
rename to src/libs/qoca/QcConstraintRep.cc
diff --git a/src/kits/interface/qoca/QcConstraintRep.hh b/src/libs/qoca/QcConstraintRep.hh
similarity index 100%
rename from src/kits/interface/qoca/QcConstraintRep.hh
rename to src/libs/qoca/QcConstraintRep.hh
diff --git a/src/kits/interface/qoca/QcCoreTableau.cc b/src/libs/qoca/QcCoreTableau.cc
similarity index 100%
rename from src/kits/interface/qoca/QcCoreTableau.cc
rename to src/libs/qoca/QcCoreTableau.cc
diff --git a/src/kits/interface/qoca/QcCoreTableau.hh b/src/libs/qoca/QcCoreTableau.hh
similarity index 100%
rename from src/kits/interface/qoca/QcCoreTableau.hh
rename to src/libs/qoca/QcCoreTableau.hh
diff --git a/src/kits/interface/qoca/QcDefines.hh b/src/libs/qoca/QcDefines.hh
similarity index 100%
rename from src/kits/interface/qoca/QcDefines.hh
rename to src/libs/qoca/QcDefines.hh
diff --git a/src/kits/interface/qoca/QcDelCoreTableau.cc b/src/libs/qoca/QcDelCoreTableau.cc
similarity index 100%
rename from src/kits/interface/qoca/QcDelCoreTableau.cc
rename to src/libs/qoca/QcDelCoreTableau.cc
diff --git a/src/kits/interface/qoca/QcDelCoreTableau.hh b/src/libs/qoca/QcDelCoreTableau.hh
similarity index 100%
rename from src/kits/interface/qoca/QcDelCoreTableau.hh
rename to src/libs/qoca/QcDelCoreTableau.hh
diff --git a/src/kits/interface/qoca/QcDelLinEqSystem.hh b/src/libs/qoca/QcDelLinEqSystem.hh
similarity index 100%
rename from src/kits/interface/qoca/QcDelLinEqSystem.hh
rename to src/libs/qoca/QcDelLinEqSystem.hh
diff --git a/src/kits/interface/qoca/QcDelLinEqTableau.cc b/src/libs/qoca/QcDelLinEqTableau.cc
similarity index 100%
rename from src/kits/interface/qoca/QcDelLinEqTableau.cc
rename to src/libs/qoca/QcDelLinEqTableau.cc
diff --git a/src/kits/interface/qoca/QcDelLinEqTableau.hh b/src/libs/qoca/QcDelLinEqTableau.hh
similarity index 100%
rename from src/kits/interface/qoca/QcDelLinEqTableau.hh
rename to src/libs/qoca/QcDelLinEqTableau.hh
diff --git a/src/kits/interface/qoca/QcDelLinInEqSystem.hh b/src/libs/qoca/QcDelLinInEqSystem.hh
similarity index 100%
rename from src/kits/interface/qoca/QcDelLinInEqSystem.hh
rename to src/libs/qoca/QcDelLinInEqSystem.hh
diff --git a/src/kits/interface/qoca/QcDelLinInEqTableau.cc b/src/libs/qoca/QcDelLinInEqTableau.cc
similarity index 100%
rename from src/kits/interface/qoca/QcDelLinInEqTableau.cc
rename to src/libs/qoca/QcDelLinInEqTableau.cc
diff --git a/src/kits/interface/qoca/QcDelLinInEqTableau.hh b/src/libs/qoca/QcDelLinInEqTableau.hh
similarity index 100%
rename from src/kits/interface/qoca/QcDelLinInEqTableau.hh
rename to src/libs/qoca/QcDelLinInEqTableau.hh
diff --git a/src/kits/interface/qoca/QcDenseMatrix.cc b/src/libs/qoca/QcDenseMatrix.cc
similarity index 100%
rename from src/kits/interface/qoca/QcDenseMatrix.cc
rename to src/libs/qoca/QcDenseMatrix.cc
diff --git a/src/kits/interface/qoca/QcDenseMatrix.hh b/src/libs/qoca/QcDenseMatrix.hh
similarity index 100%
rename from src/kits/interface/qoca/QcDenseMatrix.hh
rename to src/libs/qoca/QcDenseMatrix.hh
diff --git a/src/kits/interface/qoca/QcDenseMatrixColIterator.hh b/src/libs/qoca/QcDenseMatrixColIterator.hh
similarity index 100%
rename from src/kits/interface/qoca/QcDenseMatrixColIterator.hh
rename to src/libs/qoca/QcDenseMatrixColIterator.hh
diff --git a/src/kits/interface/qoca/QcDenseMatrixIterator.hh b/src/libs/qoca/QcDenseMatrixIterator.hh
similarity index 100%
rename from src/kits/interface/qoca/QcDenseMatrixIterator.hh
rename to src/libs/qoca/QcDenseMatrixIterator.hh
diff --git a/src/kits/interface/qoca/QcDenseMatrixRowIterator.hh b/src/libs/qoca/QcDenseMatrixRowIterator.hh
similarity index 100%
rename from src/kits/interface/qoca/QcDenseMatrixRowIterator.hh
rename to src/libs/qoca/QcDenseMatrixRowIterator.hh
diff --git a/src/kits/interface/qoca/QcDenseTableauColIterator.hh b/src/libs/qoca/QcDenseTableauColIterator.hh
similarity index 100%
rename from src/kits/interface/qoca/QcDenseTableauColIterator.hh
rename to src/libs/qoca/QcDenseTableauColIterator.hh
diff --git a/src/kits/interface/qoca/QcDenseTableauIterator.hh b/src/libs/qoca/QcDenseTableauIterator.hh
similarity index 100%
rename from src/kits/interface/qoca/QcDenseTableauIterator.hh
rename to src/libs/qoca/QcDenseTableauIterator.hh
diff --git a/src/kits/interface/qoca/QcDenseTableauRowIterator.hh b/src/libs/qoca/QcDenseTableauRowIterator.hh
similarity index 100%
rename from src/kits/interface/qoca/QcDenseTableauRowIterator.hh
rename to src/libs/qoca/QcDenseTableauRowIterator.hh
diff --git a/src/kits/interface/qoca/QcDesireValueStore.hh b/src/libs/qoca/QcDesireValueStore.hh
similarity index 100%
rename from src/kits/interface/qoca/QcDesireValueStore.hh
rename to src/libs/qoca/QcDesireValueStore.hh
diff --git a/src/kits/interface/qoca/QcEnables.H b/src/libs/qoca/QcEnables.H
similarity index 100%
rename from src/kits/interface/qoca/QcEnables.H
rename to src/libs/qoca/QcEnables.H
diff --git a/src/kits/interface/qoca/QcEnables.H.in b/src/libs/qoca/QcEnables.H.in
similarity index 100%
rename from src/kits/interface/qoca/QcEnables.H.in
rename to src/libs/qoca/QcEnables.H.in
diff --git a/src/kits/interface/qoca/QcException.hh b/src/libs/qoca/QcException.hh
similarity index 100%
rename from src/kits/interface/qoca/QcException.hh
rename to src/libs/qoca/QcException.hh
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rename from src/kits/interface/qoca/QcSolver.hh
rename to src/libs/qoca/QcSolver.hh
diff --git a/src/kits/interface/qoca/QcSparseCoeff.hh b/src/libs/qoca/QcSparseCoeff.hh
similarity index 100%
rename from src/kits/interface/qoca/QcSparseCoeff.hh
rename to src/libs/qoca/QcSparseCoeff.hh
diff --git a/src/kits/interface/qoca/QcSparseMatrix.cc b/src/libs/qoca/QcSparseMatrix.cc
similarity index 100%
rename from src/kits/interface/qoca/QcSparseMatrix.cc
rename to src/libs/qoca/QcSparseMatrix.cc
diff --git a/src/kits/interface/qoca/QcSparseMatrix.hh b/src/libs/qoca/QcSparseMatrix.hh
similarity index 100%
rename from src/kits/interface/qoca/QcSparseMatrix.hh
rename to src/libs/qoca/QcSparseMatrix.hh
diff --git a/src/kits/interface/qoca/QcSparseMatrixColIterator.hh b/src/libs/qoca/QcSparseMatrixColIterator.hh
similarity index 100%
rename from src/kits/interface/qoca/QcSparseMatrixColIterator.hh
rename to src/libs/qoca/QcSparseMatrixColIterator.hh
diff --git a/src/kits/interface/qoca/QcSparseMatrixElement.hh b/src/libs/qoca/QcSparseMatrixElement.hh
similarity index 100%
rename from src/kits/interface/qoca/QcSparseMatrixElement.hh
rename to src/libs/qoca/QcSparseMatrixElement.hh
diff --git a/src/kits/interface/qoca/QcSparseMatrixIterator.hh b/src/libs/qoca/QcSparseMatrixIterator.hh
similarity index 100%
rename from src/kits/interface/qoca/QcSparseMatrixIterator.hh
rename to src/libs/qoca/QcSparseMatrixIterator.hh
diff --git a/src/kits/interface/qoca/QcSparseMatrixRowIterator.hh b/src/libs/qoca/QcSparseMatrixRowIterator.hh
similarity index 100%
rename from src/kits/interface/qoca/QcSparseMatrixRowIterator.hh
rename to src/libs/qoca/QcSparseMatrixRowIterator.hh
diff --git a/src/kits/interface/qoca/QcState.hh b/src/libs/qoca/QcState.hh
similarity index 100%
rename from src/kits/interface/qoca/QcState.hh
rename to src/libs/qoca/QcState.hh
diff --git a/src/kits/interface/qoca/QcStateVector.hh b/src/libs/qoca/QcStateVector.hh
similarity index 100%
rename from src/kits/interface/qoca/QcStateVector.hh
rename to src/libs/qoca/QcStateVector.hh
diff --git a/src/kits/interface/qoca/QcStructVarIndexIterator.hh b/src/libs/qoca/QcStructVarIndexIterator.hh
similarity index 100%
rename from src/kits/interface/qoca/QcStructVarIndexIterator.hh
rename to src/libs/qoca/QcStructVarIndexIterator.hh
diff --git a/src/kits/interface/qoca/QcTableau.hh b/src/libs/qoca/QcTableau.hh
similarity index 100%
rename from src/kits/interface/qoca/QcTableau.hh
rename to src/libs/qoca/QcTableau.hh
diff --git a/src/kits/interface/qoca/QcTableauColIterator.hh b/src/libs/qoca/QcTableauColIterator.hh
similarity index 100%
rename from src/kits/interface/qoca/QcTableauColIterator.hh
rename to src/libs/qoca/QcTableauColIterator.hh
diff --git a/src/kits/interface/qoca/QcTableauRowIterator.hh b/src/libs/qoca/QcTableauRowIterator.hh
similarity index 100%
rename from src/kits/interface/qoca/QcTableauRowIterator.hh
rename to src/libs/qoca/QcTableauRowIterator.hh
diff --git a/src/kits/interface/qoca/QcUnsortedListSet.hh b/src/libs/qoca/QcUnsortedListSet.hh
similarity index 100%
rename from src/kits/interface/qoca/QcUnsortedListSet.hh
rename to src/libs/qoca/QcUnsortedListSet.hh
diff --git a/src/kits/interface/qoca/QcUtility.cc b/src/libs/qoca/QcUtility.cc
similarity index 100%
rename from src/kits/interface/qoca/QcUtility.cc
rename to src/libs/qoca/QcUtility.cc
diff --git a/src/kits/interface/qoca/QcUtility.hh b/src/libs/qoca/QcUtility.hh
similarity index 100%
rename from src/kits/interface/qoca/QcUtility.hh
rename to src/libs/qoca/QcUtility.hh
diff --git a/src/kits/interface/qoca/QcVarStow.H b/src/libs/qoca/QcVarStow.H
similarity index 100%
rename from src/kits/interface/qoca/QcVarStow.H
rename to src/libs/qoca/QcVarStow.H
diff --git a/src/kits/interface/qoca/QcVarStow.cc b/src/libs/qoca/QcVarStow.cc
similarity index 100%
rename from src/kits/interface/qoca/QcVarStow.cc
rename to src/libs/qoca/QcVarStow.cc
diff --git a/src/kits/interface/qoca/QcVarStow.ch b/src/libs/qoca/QcVarStow.ch
similarity index 100%
rename from src/kits/interface/qoca/QcVarStow.ch
rename to src/libs/qoca/QcVarStow.ch
diff --git a/src/kits/interface/qoca/QcVarStow.hh b/src/libs/qoca/QcVarStow.hh
similarity index 100%
rename from src/kits/interface/qoca/QcVarStow.hh
rename to src/libs/qoca/QcVarStow.hh
diff --git a/src/kits/interface/qoca/QcVariableBiMap.H b/src/libs/qoca/QcVariableBiMap.H
similarity index 100%
rename from src/kits/interface/qoca/QcVariableBiMap.H
rename to src/libs/qoca/QcVariableBiMap.H
diff --git a/src/kits/interface/qoca/QcVariableBiMap.cc b/src/libs/qoca/QcVariableBiMap.cc
similarity index 100%
rename from src/kits/interface/qoca/QcVariableBiMap.cc
rename to src/libs/qoca/QcVariableBiMap.cc
diff --git a/src/kits/interface/qoca/QcVariableBiMap.ch b/src/libs/qoca/QcVariableBiMap.ch
similarity index 100%
rename from src/kits/interface/qoca/QcVariableBiMap.ch
rename to src/libs/qoca/QcVariableBiMap.ch
diff --git a/src/kits/interface/qoca/QcVariableBiMap.hh b/src/libs/qoca/QcVariableBiMap.hh
similarity index 100%
rename from src/kits/interface/qoca/QcVariableBiMap.hh
rename to src/libs/qoca/QcVariableBiMap.hh
diff --git a/src/kits/interface/qoca/QcVariableIndexIterator.hh b/src/libs/qoca/QcVariableIndexIterator.hh
similarity index 100%
rename from src/kits/interface/qoca/QcVariableIndexIterator.hh
rename to src/libs/qoca/QcVariableIndexIterator.hh
diff --git a/src/kits/interface/qoca/arith.H b/src/libs/qoca/arith.H
similarity index 100%
rename from src/kits/interface/qoca/arith.H
rename to src/libs/qoca/arith.H
diff --git a/src/kits/interface/qoca/arith.ch b/src/libs/qoca/arith.ch
similarity index 100%
rename from src/kits/interface/qoca/arith.ch
rename to src/libs/qoca/arith.ch