diff --git a/glabels/BarcodeStyle.cpp b/glabels/BarcodeStyle.cpp
index ed9d2b5..d9f91a2 100644
--- a/glabels/BarcodeStyle.cpp
+++ b/glabels/BarcodeStyle.cpp
@@ -20,8 +20,6 @@
 
 #include "BarcodeStyle.h"
 
-#include <algorithm>
-
 
 ///
 /// Default Constructor
@@ -163,11 +161,9 @@ int BarcodeStyle::preferedN() const
 ///
 QString BarcodeStyle::exampleDigits( int n ) const
 {
-	using std::max;
-
 	if ( mCanFreeform )
 	{
-		return QString( max( n, 1 ), QChar('0') );
+		return QString( qMax( n, 1 ), QChar('0') );
 	}
 	else
 	{
diff --git a/glabels/LabelEditor.cpp b/glabels/LabelEditor.cpp
index 48b0d97..422e9af 100644
--- a/glabels/LabelEditor.cpp
+++ b/glabels/LabelEditor.cpp
@@ -20,8 +20,7 @@
 
 #include "LabelEditor.h"
 
-#include <algorithm>
-#include <cmath>
+#include <QtMath>
 #include <QMouseEvent>
 #include <QtDebug>
 
@@ -181,11 +180,11 @@ LabelEditor::zoomIn()
 	// Find closest standard zoom level to our current zoom
 	// Start with 2nd largest scale
 	int i_min = 1;
-	double dist_min = fabs( zoomLevels[1] - mZoom );
+	double dist_min = qFabs( zoomLevels[1] - mZoom );
 
 	for ( int i = 2; i < nZoomLevels; i++ )
 	{
-		double dist = fabs( zoomLevels[i] - mZoom );
+		double dist = qFabs( zoomLevels[i] - mZoom );
 		if ( dist < dist_min )
 		{
 			i_min = i;
@@ -207,11 +206,11 @@ LabelEditor::zoomOut()
 	// Find closest standard zoom level to our current zoom
 	// Start with largest scale, end on 2nd smallest
 	int i_min = 0;
-	double dist_min = fabs( zoomLevels[0] - mZoom );
+	double dist_min = qFabs( zoomLevels[0] - mZoom );
 
 	for ( int i = 1; i < (nZoomLevels-1); i++ )
 	{
-		double dist = fabs( zoomLevels[i] - mZoom );
+		double dist = qFabs( zoomLevels[i] - mZoom );
 		if ( dist < dist_min )
 		{
 			i_min = i;
@@ -240,19 +239,16 @@ LabelEditor::zoom1To1()
 void
 LabelEditor::zoomToFit()
 {
-	using std::min;
-	using std::max;
-
 	double wPixels = mScrollArea->maximumViewportSize().width();
 	double hPixels = mScrollArea->maximumViewportSize().height();
 	
 	double x_scale = ( wPixels - ZOOM_TO_FIT_PAD ) / mModel->w().pt();
 	double y_scale = ( hPixels - ZOOM_TO_FIT_PAD ) / mModel->h().pt();
-	double newZoom = min( x_scale, y_scale ) * PTS_PER_INCH / physicalDpiX();
+	double newZoom = qMin( x_scale, y_scale ) * PTS_PER_INCH / physicalDpiX();
 
 	// Limits
-	newZoom = min( newZoom, zoomLevels[0] );
-	newZoom = max( newZoom, zoomLevels[nZoomLevels-1] );
+	newZoom = qMin( newZoom, zoomLevels[0] );
+	newZoom = qMax( newZoom, zoomLevels[nZoomLevels-1] );
 
 	setZoomReal( newZoom, true );
 }
@@ -563,9 +559,6 @@ LabelEditor::mousePressEvent( QMouseEvent* event )
 void
 LabelEditor::mouseMoveEvent( QMouseEvent* event )
 {
-	using std::min;
-	using std::max;
-
 	if ( mModel )
 	{
 		/*
@@ -1211,9 +1204,6 @@ void LabelEditor::onSettingsChanged()
 ///
 void LabelEditor::onModelSizeChanged()
 {
-	using std::min;
-	using std::max;
-
 	if (mZoomToFitFlag)
 	{
 		double wPixels = mScrollArea->maximumViewportSize().width();
@@ -1221,11 +1211,11 @@ void LabelEditor::onModelSizeChanged()
 	
 		double x_scale = ( wPixels - ZOOM_TO_FIT_PAD ) / mModel->w().pt();
 		double y_scale = ( hPixels - ZOOM_TO_FIT_PAD ) / mModel->h().pt();
-		double newZoom = min( x_scale, y_scale ) * PTS_PER_INCH / physicalDpiX();
+		double newZoom = qMin( x_scale, y_scale ) * PTS_PER_INCH / physicalDpiX();
 
 		// Limits
-		newZoom = min( newZoom, zoomLevels[0] );
-		newZoom = max( newZoom, zoomLevels[nZoomLevels-1] );
+		newZoom = qMin( newZoom, zoomLevels[0] );
+		newZoom = qMax( newZoom, zoomLevels[nZoomLevels-1] );
 
 		mZoom = newZoom;
 	}
diff --git a/glabels/LabelModel.cpp b/glabels/LabelModel.cpp
index 336c37f..16f8b46 100644
--- a/glabels/LabelModel.cpp
+++ b/glabels/LabelModel.cpp
@@ -21,8 +21,6 @@
 #include "LabelModel.h"
 
 #include <QFileInfo>
-#include <algorithm>
-#include <cmath>
 #include <QApplication>
 #include <QClipboard>
 #include <QMimeData>
@@ -500,9 +498,6 @@ void LabelModel::unselectAll()
 ///
 void LabelModel::selectRegion( const LabelRegion &region )
 {
-	using std::min;
-	using std::max;
-
 	glabels::Distance rX1 = min( region.x1(), region.x2() );
 	glabels::Distance rY1 = min( region.y1(), region.y2() );
 	glabels::Distance rX2 = max( region.x1(), region.x2() );
diff --git a/glabels/LabelModelObject.cpp b/glabels/LabelModelObject.cpp
index eec422f..b6837f0 100644
--- a/glabels/LabelModelObject.cpp
+++ b/glabels/LabelModelObject.cpp
@@ -21,8 +21,6 @@
 #include "LabelModelObject.h"
 
 #include <QFont>
-#include <algorithm>
-#include <cmath>
 #include <QtDebug>
 
 #include "ColorNode.h"
@@ -874,8 +872,7 @@ void LabelModelObject::setHHonorAspect( const glabels::Distance& h )
 ///
 LabelRegion LabelModelObject::getExtent()
 {
-	using std::min;
-	using std::max;
+	using namespace glabels;
 
 	QPointF a1( (   - lineWidth()/2).pt(), (   - lineWidth()/2).pt() );
 	QPointF a2( (mW + lineWidth()/2).pt(), (   - lineWidth()/2).pt() );
@@ -888,10 +885,10 @@ LabelRegion LabelModelObject::getExtent()
 	a4 = mMatrix.map( a4 );
 
 	LabelRegion region;
-	region.setX1( glabels::Distance(min( a1.x(), min( a2.x(), min( a3.x(), a4.x() ) ) )) + mX0 );
-	region.setY1( glabels::Distance(min( a1.y(), min( a2.y(), min( a3.y(), a4.y() ) ) )) + mY0 );
-	region.setX2( glabels::Distance(max( a1.x(), max( a2.x(), max( a3.x(), a4.x() ) ) )) + mX0 );
-	region.setY2( glabels::Distance(max( a1.y(), max( a2.y(), max( a3.y(), a4.y() ) ) )) + mY0 );
+	region.setX1( min( a1.x(), min( a2.x(), min( a3.x(), a4.x() ) ) ) + mX0 );
+	region.setY1( min( a1.y(), min( a2.y(), min( a3.y(), a4.y() ) ) ) + mY0 );
+	region.setX2( max( a1.x(), max( a2.x(), max( a3.x(), a4.x() ) ) ) + mX0 );
+	region.setY2( max( a1.y(), max( a2.y(), max( a3.y(), a4.y() ) ) ) + mY0 );
 
 	return region;
 }
diff --git a/glabels/LabelRegion.cpp b/glabels/LabelRegion.cpp
index e57d8f7..574f49b 100644
--- a/glabels/LabelRegion.cpp
+++ b/glabels/LabelRegion.cpp
@@ -20,9 +20,6 @@
 
 #include "LabelRegion.h"
 
-#include <algorithm>
-#include <cmath>
-
 
 ///
 /// Get x1
@@ -101,9 +98,6 @@ void LabelRegion::setY2( const glabels::Distance& value )
 ///
 QRectF LabelRegion::rect() const
 {
-	using std::min;
-	using std::fabs;
-
 	QRectF r;
 
 	r.setX( min( mX1, mX2 ).pt() );
diff --git a/glabels/Merge/Text.cpp b/glabels/Merge/Text.cpp
index 6558e1b..67d87e1 100644
--- a/glabels/Merge/Text.cpp
+++ b/glabels/Merge/Text.cpp
@@ -21,7 +21,6 @@
 #include "Text.h"
 
 #include "Record.h"
-#include <algorithm>
 #include <QtDebug>
 
 
diff --git a/glabels/ObjectEditor.cpp b/glabels/ObjectEditor.cpp
index 50521d1..bdaf74d 100644
--- a/glabels/ObjectEditor.cpp
+++ b/glabels/ObjectEditor.cpp
@@ -34,7 +34,7 @@
 #include "Settings.h"
 
 #include <QFileDialog>
-#include <cmath>
+#include <QtMath>
 #include <QtDebug>
 
 
@@ -180,7 +180,7 @@ void ObjectEditor::loadLineSizePage()
 		double w = mObject->w().inUnits(mUnits);
 		double h = mObject->h().inUnits(mUnits);
 		sizeLineLengthSpin->setValue( sqrt( w*w + h*h ) );
-		sizeLineAngleSpin->setValue( (180/M_PI)*atan2( h, w ) );
+		sizeLineAngleSpin->setValue( qRadiansToDegrees( qAtan2( h, w ) ) );
 
 		mBlocked = false;			
 	}
@@ -515,9 +515,9 @@ void ObjectEditor::onLineSizeControlsChanged()
 		mUndoRedoModel->checkpoint( tr("Size") );
 		
 		glabels::Distance spinLength = glabels::Distance(sizeLineLengthSpin->value(), mUnits);
-		double spinAngleRads = (M_PI/180)*sizeLineAngleSpin->value();
+		double spinAngleRads = qDegreesToRadians( sizeLineAngleSpin->value() );
 				
-		mObject->setSize( spinLength*cos(spinAngleRads), spinLength*sin(spinAngleRads) );
+		mObject->setSize( spinLength*qCos(spinAngleRads), spinLength*qSin(spinAngleRads) );
 			
 		mBlocked = false;
 	}
diff --git a/libglabels/Distance.inl b/libglabels/Distance.inl
index f10d34c..b8d70f7 100644
--- a/libglabels/Distance.inl
+++ b/libglabels/Distance.inl
@@ -20,7 +20,7 @@
 
 
 #include "Constants.h"
-#include <cmath>
+#include <QtMath>
 
 
 namespace glabels
@@ -195,7 +195,7 @@ namespace glabels
 
 	inline Distance fabs( const Distance& d )
 	{
-		return Distance::pt( std::fabs( d.mDPts ) );
+		return Distance::pt( qFabs( d.mDPts ) );
 	}
 
 	
diff --git a/libglabels/FrameCd.cpp b/libglabels/FrameCd.cpp
index 5ee209f..02401de 100644
--- a/libglabels/FrameCd.cpp
+++ b/libglabels/FrameCd.cpp
@@ -20,8 +20,6 @@
 
 #include "FrameCd.h"
 
-#include <cmath>
-
 #include "StrUtil.h"
 #include "privateConstants.h"
 #include <QtDebug>
diff --git a/libglabels/FrameEllipse.cpp b/libglabels/FrameEllipse.cpp
index 8e7e8b1..ce36037 100644
--- a/libglabels/FrameEllipse.cpp
+++ b/libglabels/FrameEllipse.cpp
@@ -20,8 +20,6 @@
 
 #include "FrameEllipse.h"
 
-#include <cmath>
-
 #include "StrUtil.h"
 #include "privateConstants.h"
 
diff --git a/libglabels/FrameRect.cpp b/libglabels/FrameRect.cpp
index 108acdb..eb770cd 100644
--- a/libglabels/FrameRect.cpp
+++ b/libglabels/FrameRect.cpp
@@ -20,8 +20,6 @@
 
 #include "FrameRect.h"
 
-#include <cmath>
-
 #include "StrUtil.h"
 #include "privateConstants.h"
 
diff --git a/libglabels/FrameRound.cpp b/libglabels/FrameRound.cpp
index 041af77..68efba0 100644
--- a/libglabels/FrameRound.cpp
+++ b/libglabels/FrameRound.cpp
@@ -20,8 +20,6 @@
 
 #include "FrameRound.h"
 
-#include <cmath>
-
 #include "StrUtil.h"
 #include "privateConstants.h"
 
diff --git a/libglabels/StrUtil.cpp b/libglabels/StrUtil.cpp
index 0489088..ea38621 100644
--- a/libglabels/StrUtil.cpp
+++ b/libglabels/StrUtil.cpp
@@ -20,7 +20,7 @@
 
 #include "StrUtil.h"
 
-#include <cmath>
+#include <QtMath>
 
 
 namespace
@@ -49,7 +49,7 @@ namespace glabels
                         for ( i=0; denom[i] != 0.0; i++ )
                         {
                                 product = x * denom[i];
-                                remainder = fabs(product - ((int)(product+0.5)));
+                                remainder = qFabs(product - ((int)(product+0.5)));
                                 if ( remainder < FRAC_EPSILON ) break;
                         }