diff --git a/Doxyfile b/Doxyfile
index 092d8c9..00a6fd3 100644
--- a/Doxyfile
+++ b/Doxyfile
@@ -1254,7 +1254,7 @@ SERVER_BASED_SEARCH    = NO
 # If the GENERATE_LATEX tag is set to YES (the default) Doxygen will 
 # generate Latex output.
 
-GENERATE_LATEX         = NO
+GENERATE_LATEX         = YES
 
 # The LATEX_OUTPUT tag is used to specify where the LaTeX docs will be put. 
 # If a relative path is entered the value of OUTPUT_DIRECTORY will be 
@@ -1325,7 +1325,7 @@ USE_PDFLATEX           = YES
 # running if errors occur, instead of asking the user for help. 
 # This option is also used when generating formulas in HTML.
 
-LATEX_BATCHMODE        = NO
+LATEX_BATCHMODE        = YES
 
 # If LATEX_HIDE_INDICES is set to YES then doxygen will not 
 # include the index chapters (such as File Index, Compound Index, etc.) 
@@ -1633,7 +1633,7 @@ HIDE_UNDOC_RELATIONS   = YES
 # toolkit from AT&T and Lucent Bell Labs. The other options in this section 
 # have no effect if this option is set to NO (the default)
 
-HAVE_DOT               = NO
+HAVE_DOT               = YES
 
 # The DOT_NUM_THREADS specifies the number of dot invocations doxygen is 
 # allowed to run in parallel. When set to 0 (the default) doxygen will 
@@ -1668,7 +1668,7 @@ DOT_FONTPATH           =
 # indirect inheritance relations. Setting this tag to YES will force the 
 # CLASS_DIAGRAMS tag to NO.
 
-CLASS_GRAPH            = YES
+CLASS_GRAPH            = NO
 
 # If the COLLABORATION_GRAPH and HAVE_DOT tags are set to YES then doxygen 
 # will generate a graph for each documented class showing the direct and 
@@ -1686,7 +1686,7 @@ GROUP_GRAPHS           = YES
 # collaboration diagrams in a style similar to the OMG's Unified Modeling 
 # Language.
 
-UML_LOOK               = NO
+UML_LOOK               = YES
 
 # If the UML_LOOK tag is enabled, the fields and methods are shown inside 
 # the class node. If there are many fields or methods and many nodes the 
diff --git a/src/mainandlog/logviewerdialog.cpp b/src/mainandlog/logviewerdialog.cpp
index 8eaa646..3ac3cf1 100644
--- a/src/mainandlog/logviewerdialog.cpp
+++ b/src/mainandlog/logviewerdialog.cpp
@@ -1,13 +1,24 @@
 #include "logviewerdialog.h"
- 
+#include <qglobal.h>
+
+#if QT_VERSION >= 0x050000
 #include <QtWidgets\QVBoxLayout>
 #include <QtWidgets\QHBoxLayout>
 #include <QtWidgets\QPlainTextEdit>
 #include <QtWidgets\QPushButton>
 #include <QtWidgets\QFileDialog>
+#include <QtWidgets\QMessageBox>
+#else
+#include <QVBoxLayout>
+#include <QHBoxLayout>
+#include <QPlainTextEdit>
+#include <QPushButton>
+#include <QFileDialog>
+#include <QMessageBox>
+#endif
+
 #include <QDir>
 #include <QFile>
-#include <QtWidgets\QMessageBox>
 #include <QTextStream>
 #include <QCloseEvent>
 #include <QKeyEvent>
diff --git a/src/mainandlog/logviewerdialog.h b/src/mainandlog/logviewerdialog.h
index 629c3fd..a6727d5 100644
--- a/src/mainandlog/logviewerdialog.h
+++ b/src/mainandlog/logviewerdialog.h
@@ -1,8 +1,14 @@
 #ifndef LOGVIEWERDIALOG_H
 #define LOGVIEWERDIALOG_H
  
-#include <QtWidgets\QDialog>
+#include <qglobal.h>
+
 
+#if QT_VERSION >= 0x050000
+#include <QtWidgets\QDialog>
+#else
+#include <QDialog>
+#endif
 QT_BEGIN_NAMESPACE
 class QTextBrowser;
 class QPlainTextEdit;
diff --git a/src/mainandlog/main.cpp b/src/mainandlog/main.cpp
index 884f601..306efc0 100644
--- a/src/mainandlog/main.cpp
+++ b/src/mainandlog/main.cpp
@@ -4,7 +4,7 @@
     The main function instantiates the Main Window object,
     to which all the various 'wigets' are attached. (ie: the serial_widget)
 */
-
+#include <qglobal.h>
 
 #ifndef __PRETTY_FUNCTION__
  #ifndef __FUNCDNAME__
@@ -21,7 +21,12 @@
  */
 bool VERBOSE = true;
 
-#include <QtWidgets\QApplication>
+#if QT_VERSION >= 0x050000
+ #include <QtWidgets\QApplication>
+#else
+ #include <QtGui/QApplication>
+#endif
+
 #include <QString>
 #include <QtDebug>
 #include <QPointer>
@@ -40,11 +45,22 @@ QPointer<LogViewer> logViewer;
 /*!
   Custom message handler that redirects messages to a log viewer (if available).
 */
+#if QT_VERSION >= 0x050000
 void MyMessageOutput(QtMsgType Type, const QMessageLogContext& Context, const QString &Message)
 {
     if(logViewer)
        logViewer->outputMessage( Type, Message );
 }
+#else
+void myMessageOutput(QtMsgType type, const char *msg)
+{
+    if(logViewer)
+    {
+        logViewer->outputMessage( type, msg );
+    }
+}
+#endif
+
 
 int main(int argc, char *argv[])
 {
@@ -59,8 +75,12 @@ int main(int argc, char *argv[])
 
     // Instantiate a log viewer and redirect debug messages to it.
     logViewer = new LogViewer;
-    qInstallMessageHandler(MyMessageOutput);
 
+#if QT_VERSION >= 0x050000
+    qInstallMessageHandler(MyMessageOutput);
+#else
+    qInstallMsgHandler(myMessageOutput);
+#endif
     // Instantiate the Main Window
     MainWindow w(0, logViewer);
     w.setAttribute(Qt::WA_AlwaysShowToolTips);
diff --git a/src/mainandlog/mainwindow.h b/src/mainandlog/mainwindow.h
index e1b803f..0b4bdee 100644
--- a/src/mainandlog/mainwindow.h
+++ b/src/mainandlog/mainwindow.h
@@ -1,13 +1,22 @@
 #ifndef MAINWINDOW_H
 #define MAINWINDOW_H
 
+#include <qglobal.h>
+
+#if QT_VERSION >= 0x050000
 #include <QtWidgets\QMainWindow>
-#include <QPointer>
 #include <QtWidgets\QMenu>
 #include <QtWidgets\QMenuBar>
 #include <QtWidgets\QAction>
-#include <abstractserial.h>
+#else
+#include <QMainWindow>
+#include <QMenu>
+#include <QMenuBar>
+#include <QAction>
+#endif
 
+#include <abstractserial.h>
+#include <QPointer>
 
 #include "serialtools/connectioncontroller.h"
 #include "servoboard/servoboardcontroller.h"
diff --git a/src/serialtools/connectioncontroller.cpp b/src/serialtools/connectioncontroller.cpp
index 4e79e6d..c508378 100644
--- a/src/serialtools/connectioncontroller.cpp
+++ b/src/serialtools/connectioncontroller.cpp
@@ -120,6 +120,8 @@ void ConnectionController::open(QString port)
     if (!this->port->open(QIODevice::ReadWrite))
     {
         qDebug() << "Port failed to open in connectControl";
+        view->connectionFailedWarning();
+        return;
     }
 
     this->port->setBaudRate("9600 baud");
diff --git a/src/serialtools/infowidget.h b/src/serialtools/infowidget.h
index ecf9fb6..e781354 100644
--- a/src/serialtools/infowidget.h
+++ b/src/serialtools/infowidget.h
@@ -1,7 +1,13 @@
 #ifndef INFOWIDGET_H
 #define INFOWIDGET_H
 
+#include <qglobal.h>
+
+#if QT_VERSION >= 0x050000
 #include <QWidget>
+#else
+#include <QtGui/QWidget>
+#endif
 
 namespace Ui {
     class InfoWidget;
diff --git a/src/serialtools/serial_widget.cpp b/src/serialtools/serial_widget.cpp
index a9d416c..c985506 100644
--- a/src/serialtools/serial_widget.cpp
+++ b/src/serialtools/serial_widget.cpp
@@ -1,6 +1,16 @@
+#include <qglobal.h>
+
+
+#if QT_VERSION >= 0x050000
+ #include <QtWidgets\QMessageBox>
+#else
+ #include <QMessageBox>
+#endif
+
 #include <QtCore/QStringList>
 #include <QtCore/QDebug>
-#include <QtWidgets\QMessageBox>
+
+
 
 #include "serial_widget.h"
 #include "ui_serial_widget.h"
@@ -389,6 +399,14 @@ void SerialWidget::updateInfoData(SerialDeviceEnumerator* enumerator, QString& n
         this->infoWidget->updateInfo(data);
     }
 }
+
+void SerialWidget::connectionFailedWarning()
+{
+    QMessageBox warn(this);
+    warn.setText(tr("Connection failed, check to make sure the port is not being used elsewhere"));
+    warn.setIcon(QMessageBox::Warning);
+    warn.exec();
+}
 /*
 
     Returns the AbstractSerial Object.
diff --git a/src/serialtools/serial_widget.h b/src/serialtools/serial_widget.h
index f034700..773de77 100644
--- a/src/serialtools/serial_widget.h
+++ b/src/serialtools/serial_widget.h
@@ -1,8 +1,16 @@
 #ifndef SERIALWIDGET_H
 #define SERIALWIDGET_H
+#include <qglobal.h>
+
+
+#if QT_VERSION >= 0x050000
+ #include <QtWidgets\QWidget>
+ #include <QtCore\QDateTime>
+#else
+ #include <QtGui/QWidget>
+ #include <QtCore/QDateTime>
+#endif
 
-#include <QtWidgets\QWidget>
-#include <QtCore\QDateTime>
 
 
 QT_BEGIN_NAMESPACE
@@ -38,7 +46,7 @@ class SerialWidget : public QWidget
                                           QStringList& parity, QStringList& stopBits,
                                            QStringList& flow);
     void updateInfoData(SerialDeviceEnumerator* enumerator,QString& name);
-
+    void connectionFailedWarning();
 
     void initSerialWidgetCloseState();
     void initSerialWidgetOpenState();
diff --git a/src/serialtools/tracewidget.cpp b/src/serialtools/tracewidget.cpp
index 3c78882..24d41f3 100644
--- a/src/serialtools/tracewidget.cpp
+++ b/src/serialtools/tracewidget.cpp
@@ -1,4 +1,11 @@
+#include <qglobal.h>
+
+
+#if QT_VERSION >= 0x050000
 #include <QtWidgets\QScrollBar>
+#else
+#include <QScrollBar>
+#endif
 
 #include "tracewidget.h"
 #include "ui_tracewidget.h"
diff --git a/src/serialtools/tracewidget.h b/src/serialtools/tracewidget.h
index 4c7b220..7a5d339 100644
--- a/src/serialtools/tracewidget.h
+++ b/src/serialtools/tracewidget.h
@@ -1,7 +1,13 @@
 #ifndef TRACEWIDGET_H
 #define TRACEWIDGET_H
+#include <qglobal.h>
 
-#include <QtWidgets\QWidget>
+
+#if QT_VERSION >= 0x050000
+ #include <QtWidgets\QWidget>
+#else
+ #include <QWidget>
+#endif
 
 namespace Ui {
     class TraceWidget;
diff --git a/src/servoboard/advancedlineoptionsdialog.h b/src/servoboard/advancedlineoptionsdialog.h
index 5d5ea35..26ffa12 100644
--- a/src/servoboard/advancedlineoptionsdialog.h
+++ b/src/servoboard/advancedlineoptionsdialog.h
@@ -1,7 +1,13 @@
 #ifndef ADVANCEDLINEOPTIONSDIALOG_H
 #define ADVANCEDLINEOPTIONSDIALOG_H
+#include <qglobal.h>
 
+
+#if QT_VERSION >= 0x050000
 #include <QtWidgets\QDialog>
+#else
+ #include <QDialog>
+#endif
 #include <QDebug>
 
 namespace Ui {
diff --git a/src/servoboard/servoboardcontroller.h b/src/servoboard/servoboardcontroller.h
index 5e35e10..3dd2c60 100644
--- a/src/servoboard/servoboardcontroller.h
+++ b/src/servoboard/servoboardcontroller.h
@@ -1,8 +1,15 @@
 #ifndef SERVOBOARDCONTROLLER_H
 #define SERVOBOARDCONTROLLER_H
+#include <qglobal.h>
+
+
 
 #include <QObject>
-#include <QtWidgets\QFileDialog>
+#if QT_VERSION >= 0x050000
+ #include <QtWidgets\QFileDialog>
+#else
+ #include <QtGui/QFileDialog>
+#endif
 #include <QTimer>
 
 #include <abstractserial.h>
diff --git a/src/servoboard/servocontrolbundle.h b/src/servoboard/servocontrolbundle.h
index 8650a9e..2a14f16 100644
--- a/src/servoboard/servocontrolbundle.h
+++ b/src/servoboard/servocontrolbundle.h
@@ -1,7 +1,13 @@
 #ifndef SERVOCONTROLBUNDLE_H
 #define SERVOCONTROLBUNDLE_H
+#include <qglobal.h>
 
-#include <QtWidgets\QWidget>
+
+#if QT_VERSION >= 0x050000
+ #include <QtWidgets\QWidget>
+#else
+ #include <QWidget>
+#endif
 #include "ui_servocontrolbundle.h"
 
 class ServoControlBundle : public QWidget