diff --git a/src/apps/icon-o-matic/CanvasView.cpp b/src/apps/icon-o-matic/CanvasView.cpp
index 970dae8be0..ac716cd707 100644
--- a/src/apps/icon-o-matic/CanvasView.cpp
+++ b/src/apps/icon-o-matic/CanvasView.cpp
@@ -18,6 +18,8 @@
 #include "CommandStack.h"
 #include "IconRenderer.h"
 
+using std::nothrow;
+
 // constructor
 CanvasView::CanvasView(BRect frame)
 	: StateView(frame, "canvas view", B_FOLLOW_ALL,
diff --git a/src/apps/icon-o-matic/generic/gui/stateview/StateView.cpp b/src/apps/icon-o-matic/generic/gui/stateview/StateView.cpp
index 9c364c7279..c7f6c5d733 100644
--- a/src/apps/icon-o-matic/generic/gui/stateview/StateView.cpp
+++ b/src/apps/icon-o-matic/generic/gui/stateview/StateView.cpp
@@ -22,6 +22,7 @@
 //
 #include "RWLocker.h"
 
+using std::nothrow;
 
 class EventFilter : public BMessageFilter {
  public:
diff --git a/src/apps/icon-o-matic/generic/property/Property.cpp b/src/apps/icon-o-matic/generic/property/Property.cpp
index e42797627b..15d624cbd6 100644
--- a/src/apps/icon-o-matic/generic/property/Property.cpp
+++ b/src/apps/icon-o-matic/generic/property/Property.cpp
@@ -17,7 +17,7 @@
 
 #include "support.h"
 
-using std::nowthrow;
+using std::nothrow;
 
 // constructor
 Property::Property(uint32 identifier)
diff --git a/src/apps/icon-o-matic/generic/property/specific_properties/Int64Property.cpp b/src/apps/icon-o-matic/generic/property/specific_properties/Int64Property.cpp
index bdcb1f911e..f45bdf82fc 100644
--- a/src/apps/icon-o-matic/generic/property/specific_properties/Int64Property.cpp
+++ b/src/apps/icon-o-matic/generic/property/specific_properties/Int64Property.cpp
@@ -12,7 +12,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 
-using std::nowthrow;
+using std::nothrow;
 
 // constructor
 Int64Property::Int64Property(uint32 identifier, int64 value)
diff --git a/src/apps/icon-o-matic/generic/support/support.cpp b/src/apps/icon-o-matic/generic/support/support.cpp
index a9c143dd32..1f4b1195ae 100644
--- a/src/apps/icon-o-matic/generic/support/support.cpp
+++ b/src/apps/icon-o-matic/generic/support/support.cpp
@@ -93,7 +93,7 @@ write_string(BPositionIO* stream, BString& string)
 
 // append_float
 void
-append_float(BString& string, float n, int32 maxDigits = 4)
+append_float(BString& string, float n, int32 maxDigits)
 {
 	int32 rounded = n >= 0.0 ? (int32)fabs(floorf(n)) : (int32)fabs(ceilf(n));
 
diff --git a/src/apps/icon-o-matic/generic/support/support.h b/src/apps/icon-o-matic/generic/support/support.h
index 7787e94171..ba2a510f87 100644
--- a/src/apps/icon-o-matic/generic/support/support.h
+++ b/src/apps/icon-o-matic/generic/support/support.h
@@ -27,12 +27,12 @@ constrain(float& value, float min, float max)
 // constrain_int32_0_255_asm
 inline int32
 constrain_int32_0_255_asm(int32 value) {
-    asm("movl  $0,    %%ecx;
-         movl  $255,  %%edx;
-         cmpl  %%ecx, %%eax;
-         cmovl %%ecx, %%eax;
-         cmpl  %%edx, %%eax;
-         cmovg %%edx, %%eax"
+    asm("movl  $0,    %%ecx;\n"
+        "movl  $255,  %%edx;\n"
+        "cmpl  %%ecx, %%eax;\n"
+        "cmovl %%ecx, %%eax;\n"
+        "cmpl  %%edx, %%eax;\n"
+        "cmovg %%edx, %%eax"
        : "=a" (value)
        : "a" (value) 
        : "%ecx", "%edx" );
diff --git a/src/apps/icon-o-matic/gui/PathListView.cpp b/src/apps/icon-o-matic/gui/PathListView.cpp
index 87793652c2..7244c95216 100644
--- a/src/apps/icon-o-matic/gui/PathListView.cpp
+++ b/src/apps/icon-o-matic/gui/PathListView.cpp
@@ -32,6 +32,8 @@
 #include "Util.h"
 #include "VectorPath.h"
 
+using std::nothrow;
+
 static const float kMarkWidth		= 14.0;
 static const float kBorderOffset	= 3.0;
 static const float kTextOffset		= 4.0;
diff --git a/src/apps/icon-o-matic/gui/StyleListView.cpp b/src/apps/icon-o-matic/gui/StyleListView.cpp
index b3358bbb40..cc5ae4920b 100644
--- a/src/apps/icon-o-matic/gui/StyleListView.cpp
+++ b/src/apps/icon-o-matic/gui/StyleListView.cpp
@@ -33,6 +33,8 @@
 #include "Selection.h"
 #include "Util.h"
 
+using std::nothrow;
+
 static const float kMarkWidth		= 14.0;
 static const float kBorderOffset	= 3.0;
 static const float kTextOffset		= 4.0;
diff --git a/src/apps/icon-o-matic/gui/StyleListView.h b/src/apps/icon-o-matic/gui/StyleListView.h
index c2d1215802..248d970945 100644
--- a/src/apps/icon-o-matic/gui/StyleListView.h
+++ b/src/apps/icon-o-matic/gui/StyleListView.h
@@ -19,6 +19,7 @@ class Selection;
 class Shape;
 class ShapeContainer;
 class ShapeListener;
+class ShapeStyleListener;
 class Style;
 class StyleListItem;
 
diff --git a/src/apps/icon-o-matic/gui/StyleView.cpp b/src/apps/icon-o-matic/gui/StyleView.cpp
index 5319ce6a4c..63cc2f64f2 100644
--- a/src/apps/icon-o-matic/gui/StyleView.cpp
+++ b/src/apps/icon-o-matic/gui/StyleView.cpp
@@ -24,6 +24,8 @@
 #include "SetGradientCommand.h"
 #include "Style.h"
 
+using std::nothrow;
+
 enum {
 	MSG_SET_COLOR			= 'stcl',
 
diff --git a/src/apps/icon-o-matic/import_export/Exporter.cpp b/src/apps/icon-o-matic/import_export/Exporter.cpp
index f0528e38e0..8793580917 100644
--- a/src/apps/icon-o-matic/import_export/Exporter.cpp
+++ b/src/apps/icon-o-matic/import_export/Exporter.cpp
@@ -22,6 +22,8 @@
 #include "Document.h"
 #include "Icon.h"
 
+using std::nothrow;
+
 // constructor
 Exporter::Exporter()
 	: fDocument(NULL),
diff --git a/src/apps/icon-o-matic/import_export/flat_icon/FlatIconExporter.cpp b/src/apps/icon-o-matic/import_export/flat_icon/FlatIconExporter.cpp
index 9ac3b53fcc..5b0dceaef9 100644
--- a/src/apps/icon-o-matic/import_export/flat_icon/FlatIconExporter.cpp
+++ b/src/apps/icon-o-matic/import_export/flat_icon/FlatIconExporter.cpp
@@ -235,7 +235,7 @@ FlatIconExporter::_WriteStyles(LittleEndianBuffer& buffer,
 
 		if (styleType == STYLE_TYPE_SOLID_COLOR) {
 			// solid color
-			uint32 color = (uint32&)style->Color();
+			uint32 color = *(uint32*)&style->Color();
 			if (!buffer.Write(color))
 				return B_NO_MEMORY;
 		} else if (styleType == STYLE_TYPE_SOLID_COLOR_NO_ALPHA) {
diff --git a/src/apps/icon-o-matic/import_export/flat_icon/FlatIconExporter.h b/src/apps/icon-o-matic/import_export/flat_icon/FlatIconExporter.h
index 2d3fbb01eb..e78d5f3588 100644
--- a/src/apps/icon-o-matic/import_export/flat_icon/FlatIconExporter.h
+++ b/src/apps/icon-o-matic/import_export/flat_icon/FlatIconExporter.h
@@ -28,6 +28,10 @@ class VectorPath;
 # include <Point.h>
 # include <hash_set>
 
+#if __GNUC__ >= 4
+  using __gnu_cxx::hash_set;
+#endif
+
 class PointHash {
  public:
 	int operator()(const BPoint& point) const
diff --git a/src/apps/icon-o-matic/import_export/svg/DocumentBuilder.cpp b/src/apps/icon-o-matic/import_export/svg/DocumentBuilder.cpp
index e5400c04ce..b772b802fe 100644
--- a/src/apps/icon-o-matic/import_export/svg/DocumentBuilder.cpp
+++ b/src/apps/icon-o-matic/import_export/svg/DocumentBuilder.cpp
@@ -183,7 +183,7 @@ DocumentBuilder::curve4(double x2, double y2,				   // S, s
 void
 DocumentBuilder::elliptical_arc(double rx, double ry, double angle,
 							    bool large_arc_flag, bool sweep_flag,
-							    double x, double y, bool rel = false)
+							    double x, double y, bool rel)
 {
 	angle = angle / 180.0 * pi;
 	if (rel) {
@@ -531,7 +531,10 @@ DocumentBuilder::StartGradient(bool radial)
 						"previous gradient (%s) not finished!\n", fCurrentGradient->ID());
 	}
 
-	fCurrentGradient = radial ? new SVGRadialGradient() : new SVGLinearGradient();
+	if (radial)
+		fCurrentGradient = new SVGRadialGradient();
+	else
+		fCurrentGradient = new SVGLinearGradient();
 
 	_AddGradient(fCurrentGradient);
 }
diff --git a/src/apps/icon-o-matic/shape/commands/TransformPointsCommand.cpp b/src/apps/icon-o-matic/shape/commands/TransformPointsCommand.cpp
index 222a455140..e40f71e797 100644
--- a/src/apps/icon-o-matic/shape/commands/TransformPointsCommand.cpp
+++ b/src/apps/icon-o-matic/shape/commands/TransformPointsCommand.cpp
@@ -14,6 +14,8 @@
 #include "ChannelTransform.h"
 #include "VectorPath.h"
 
+using std::nothrow;
+
 // constructor
 TransformPointsCommand::TransformPointsCommand(
 								TransformBox* box,
diff --git a/src/apps/icon-o-matic/style/SetColorCommand.cpp b/src/apps/icon-o-matic/style/SetColorCommand.cpp
index 750a9dda85..706ba57862 100644
--- a/src/apps/icon-o-matic/style/SetColorCommand.cpp
+++ b/src/apps/icon-o-matic/style/SetColorCommand.cpp
@@ -34,7 +34,7 @@ SetColorCommand::~SetColorCommand()
 status_t
 SetColorCommand::InitCheck()
 {
-	return fStyle && (uint32&)fStyle->Color() != (uint32&)fColor ?
+	return fStyle && *(uint32*)&fStyle->Color() != *(uint32*)&fColor ?
 		B_OK : B_NO_INIT;
 }
 
diff --git a/src/apps/icon-o-matic/transformable/ResetTransformationCommand.cpp b/src/apps/icon-o-matic/transformable/ResetTransformationCommand.cpp
index 6b1018ea14..5ea95a4a7d 100644
--- a/src/apps/icon-o-matic/transformable/ResetTransformationCommand.cpp
+++ b/src/apps/icon-o-matic/transformable/ResetTransformationCommand.cpp
@@ -13,6 +13,8 @@
 
 #include "ChannelTransform.h"
 
+using std::nothrow;
+
 // constructor
 ResetTransformationCommand::ResetTransformationCommand(
 								Transformable** const objects,
diff --git a/src/apps/icon-o-matic/transformable/TransformObjectsCommand.cpp b/src/apps/icon-o-matic/transformable/TransformObjectsCommand.cpp
index 98c4d6096a..bd7e700738 100644
--- a/src/apps/icon-o-matic/transformable/TransformObjectsCommand.cpp
+++ b/src/apps/icon-o-matic/transformable/TransformObjectsCommand.cpp
@@ -13,6 +13,8 @@
 
 #include "ChannelTransform.h"
 
+using std::nothrow;
+
 // constructor
 TransformObjectsCommand::TransformObjectsCommand(
 								TransformBox* box,
diff --git a/src/kits/interface/GridLayout.cpp b/src/kits/interface/GridLayout.cpp
index d85d56dd8d..1990910647 100644
--- a/src/kits/interface/GridLayout.cpp
+++ b/src/kits/interface/GridLayout.cpp
@@ -13,6 +13,8 @@
 
 #include "ViewLayoutItem.h"
 
+using std::nothrow;
+using std::swap;
 
 enum {	
 	MAX_COLUMN_ROW_COUNT	= 1024,
diff --git a/src/kits/interface/GroupLayoutBuilder.cpp b/src/kits/interface/GroupLayoutBuilder.cpp
index 089aedc484..2e6f2b3844 100644
--- a/src/kits/interface/GroupLayoutBuilder.cpp
+++ b/src/kits/interface/GroupLayoutBuilder.cpp
@@ -111,7 +111,7 @@ BGroupLayoutBuilder::Add(BLayoutItem* item, float weight)
 // AddGroup
 BGroupLayoutBuilder&
 BGroupLayoutBuilder::AddGroup(enum orientation orientation,
-	float spacing = 0.0f, float weight = 1.0f)
+	float spacing, float weight)
 {
 	if (BGroupLayout* layout = TopLayout()) {
 		BGroupView* group = new(nothrow) BGroupView(orientation, spacing);
@@ -136,7 +136,7 @@ BGroupLayoutBuilder::End()
 
 // AddGlue
 BGroupLayoutBuilder&
-BGroupLayoutBuilder::AddGlue(float weight = 1.0f)
+BGroupLayoutBuilder::AddGlue(float weight)
 {
 	if (BGroupLayout* layout = TopLayout())
 		layout->AddItem(BSpaceLayoutItem::CreateGlue(), weight);
diff --git a/src/kits/interface/PopUpMenu.cpp b/src/kits/interface/PopUpMenu.cpp
index 341a26fd91..0d5b161d92 100644
--- a/src/kits/interface/PopUpMenu.cpp
+++ b/src/kits/interface/PopUpMenu.cpp
@@ -16,6 +16,8 @@
 
 #include <new>
 
+using std::nothrow;
+
 struct popup_menu_data {
 	BPopUpMenu *object;
 	BWindow *window;
diff --git a/src/kits/interface/qoca/QcUnsortedListSet.hh b/src/kits/interface/qoca/QcUnsortedListSet.hh
index 6514ac5eeb..d0c2270cca 100644
--- a/src/kits/interface/qoca/QcUnsortedListSet.hh
+++ b/src/kits/interface/qoca/QcUnsortedListSet.hh
@@ -3,7 +3,11 @@
 
 #include <vector.h>
 
-template <class T, class Alloc = alloc>
+#if __GNUC__ >= 4
+  template <class T, class Alloc = std::allocator<T> >
+#else
+  template <class T, class Alloc = alloc>
+#endif
 class QcUnsortedListSet
 {
 public:
diff --git a/src/kits/interface/qoca/QcUtility.hh b/src/kits/interface/qoca/QcUtility.hh
index f0a71e6ff2..aba06eec48 100644
--- a/src/kits/interface/qoca/QcUtility.hh
+++ b/src/kits/interface/qoca/QcUtility.hh
@@ -33,14 +33,16 @@ class QcUtility
 {
 #if NUMT_IS_DOUBLE
 private:
-  static double const qcEps     = 2.273736754432321e-13;   // 2 ** -42
+  #define             _QC_EPS	  2.273736754432321e-13		// 2 ** -42
+  static double const qcEps     = _QC_EPS;
   static double const qcNearEps = 9.313225746154785e-10;   // 2 ** -30
   static double const qcVaguelyNearEps = 9.5367431640625e-7; // 2 ** -20
 
 public:
   /** Highest <tt>numT</tt> <var>x</var> s.t.&nbsp;<tt>IsZero(x)</tt>.
       This is a positive (non-zero) number iff numT is floating point. */
-  static double const qcMaxZeroVal = qcEps * (1 - DBL_EPSILON / 2);
+  static double const qcMaxZeroVal = _QC_EPS * (1 - DBL_EPSILON / 2);
+  #undef _QC_EPS
 
 public:
 	//-----------------------------------------------------------------------//
diff --git a/src/libs/icon/flat_icon/LittleEndianBuffer.cpp b/src/libs/icon/flat_icon/LittleEndianBuffer.cpp
index 0b119b800a..83fc48e2d5 100644
--- a/src/libs/icon/flat_icon/LittleEndianBuffer.cpp
+++ b/src/libs/icon/flat_icon/LittleEndianBuffer.cpp
@@ -10,6 +10,7 @@
 
 #include <malloc.h>
 #include <stdio.h>
+#include <string.h>
 
 #include <ByteOrder.h>
 
diff --git a/src/libs/icon/style/Gradient.h b/src/libs/icon/style/Gradient.h
index 56fcd7b1fd..b359e7f4b8 100644
--- a/src/libs/icon/style/Gradient.h
+++ b/src/libs/icon/style/Gradient.h
@@ -16,7 +16,7 @@
 # include <Archivable.h>
 
 # include "Observable.h"
-#endif ICON_O_MATIC
+#endif // ICON_O_MATIC
 
 #include "Transformable.h"