--- namecoin-nc0.3.75/namecoin-qt.pro
+++ namecoin-nc0.3.75/namecoin-qt.pro
@@ -3,7 +3,8 @@
 macx:TARGET = "Namecoin-Qt"
 VERSION = 0.3.75
 INCLUDEPATH += src src/json src/qt
-QT += network
+QT += core gui network
+greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
 DEFINES += GUI QT_GUI BOOST_THREAD_USE_LIB BOOST_SPIRIT_THREADSAFE
 CONFIG += no_include_pwd
 CONFIG += thread
@@ -118,30 +119,27 @@
 # Input
 DEPENDPATH += src src/json src/cryptopp src/qt
 
-NAMECOIN_HEADERS = headers.h strlcpy.h serialize.h uint256.h util.h key.h bignum.h base58.h \
-    script.h allocators.h db.h walletdb.h crypter.h net.h irc.h keystore.h main.h wallet.h bitcoinrpc.h uibase.h ui.h noui.h init.h auxpow.h
+HEADERS += src/headers.h src/strlcpy.h src/serialize.h src/uint256.h src/util.h src/key.h src/bignum.h src/base58.h \
+    src/script.h src/allocators.h src/db.h src/walletdb.h src/crypter.h src/net.h src/irc.h src/keystore.h src/main.h src/wallet.h src/bitcoinrpc.h src/uibase.h src/ui.h src/noui.h src/init.h src/auxpow.h
 
-NAMECOIN_SOURCES = \
-    auxpow.cpp \
-    util.cpp \
-    key.cpp \
-    script.cpp \
-    db.cpp \
-    walletdb.cpp \
-    crypter.cpp \
-    net.cpp \
-    irc.cpp \
-    keystore.cpp \
-    main.cpp \
-    wallet.cpp \
-    bitcoinrpc.cpp \
-    init.cpp \
-    cryptopp/sha.cpp \
-    cryptopp/cpu.cpp \
-    namecoin.cpp
-
-HEADERS += $$join(NAMECOIN_HEADERS, " src/", " src/",)
-SOURCES += $$join(NAMECOIN_SOURCES, " src/", " src/",)
+SOURCES += \
+    src/auxpow.cpp \
+    src/util.cpp \
+    src/key.cpp \
+    src/script.cpp \
+    src/db.cpp \
+    src/walletdb.cpp \
+    src/crypter.cpp \
+    src/net.cpp \
+    src/irc.cpp \
+    src/keystore.cpp \
+    src/main.cpp \
+    src/wallet.cpp \
+    src/bitcoinrpc.cpp \
+    src/init.cpp \
+    src/cryptopp/sha.cpp \
+    src/cryptopp/cpu.cpp \
+    src/namecoin.cpp
 
 HEADERS += \
     src/qt/netbase.h \
--- namecoin-nc0.3.75/src/qt/addressbookpage.cpp
+++ namecoin-nc0.3.75.new/src/qt/addressbookpage.cpp
@@ -140,8 +140,13 @@
     // Set column widths
     ui->tableView->horizontalHeader()->resizeSection(
             AddressTableModel::Address, 320);
+#if QT_VERSION < 0x050000
     ui->tableView->horizontalHeader()->setResizeMode(
             AddressTableModel::Label, QHeaderView::Stretch);
+#else
+    ui->tableView->horizontalHeader()->setSectionResizeMode(
+            AddressTableModel::Label, QHeaderView::Stretch);
+#endif
 
     connect(ui->tableView->selectionModel(), SIGNAL(selectionChanged(QItemSelection,QItemSelection)),
             this, SLOT(selectionChanged()));
--- namecoin-nc0.3.75/src/qt/bitcoin.cpp
+++ namecoin-nc0.3.75.new/src/qt/bitcoin.cpp
@@ -20,7 +20,9 @@
 #include <boost/filesystem.hpp>
 
 #include <QMessageBox>
+#if QT_VERSION < 0x050000
 #include <QTextCodec>
+#endif
 #include <QLocale>
 #include <QTimer>
 #include <QTranslator>
@@ -122,16 +124,14 @@
 #ifndef BITCOIN_QT_TEST
 int main(int argc, char *argv[])
 {
-    #ifndef WIN32
-	SetupEnvironment();
-    #endif
-
     // Command-line options take precedence:
     ParseParameters(argc, argv);
 
+#if QT_VERSION < 0x050000
     // Internal string conversion is all UTF-8
     QTextCodec::setCodecForTr(QTextCodec::codecForName("UTF-8"));
     QTextCodec::setCodecForCStrings(QTextCodec::codecForTr());
+#endif
 
     Q_INIT_RESOURCE(bitcoin);
     QApplication app(argc, argv);
--- namecoin-nc0.3.75/src/qt/bitcoingui.cpp
+++ namecoin-nc0.3.75.new/src/qt/bitcoingui.cpp
@@ -49,10 +49,16 @@
 #include <QDateTime>
 #include <QMovie>
 #include <QFileDialog>
+#if QT_VERSION < 0x050000
 #include <QDesktopServices>
+#else
+#include <QStandardPaths>
+#endif
 #include <QTimer>
 #include <QDragEnterEvent>
+#if QT_VERSION < 0x050000
 #include <QUrl>
+#endif
 #include <QMimeData>
 #include <QStyle>
 
@@ -933,7 +939,11 @@
 
 void BitcoinGUI::backupWallet()
 {
+#if QT_VERSION < 0x050000
     QString saveDir = QDesktopServices::storageLocation(QDesktopServices::DocumentsLocation);
+#else
+    QString saveDir = QStandardPaths::writableLocation(QStandardPaths::DocumentsLocation);
+#endif
     QString filename = QFileDialog::getSaveFileName(this, tr("Backup Wallet"), saveDir, tr("Wallet Data (*.dat)"));
     if(!filename.isEmpty()) {
         if(!walletModel->backupWallet(filename)) {
--- namecoin-nc0.3.75/src/qt/guiutil.cpp
+++ namecoin-nc0.3.75.new/src/qt/guiutil.cpp
@@ -14,8 +14,12 @@
 #include <QDoubleValidator>
 #include <QFont>
 #include <QLineEdit>
+#if QT_VERSION >= 0x050000
+#include <QUrlQuery>
+#else
 #include <QUrl>
-#include <QTextDocument> // For Qt::escape
+#endif
+#include <QTextDocument> // For Qt::mightBeRichText
 #include <QAbstractItemView>
 #include <QClipboard>
 #include <QFileDialog>
@@ -87,7 +91,12 @@
     SendCoinsRecipient rv;
     rv.address = uri.path();
     rv.amount = 0;
+#if QT_VERSION < 0x050000
     QList<QPair<QString, QString> > items = uri.queryItems();
+#else
+    QUrlQuery uriQuery(uri);
+    QList<QPair<QString, QString> > items = uriQuery.queryItems();
+#endif
     for (QList<QPair<QString, QString> >::iterator i = items.begin(); i != items.end(); i++)
     {
         bool fShouldReturnFalse = false;
@@ -140,7 +149,11 @@
 
 QString HtmlEscape(const QString& str, bool fMultiLine)
 {
+#if QT_VERSION < 0x050000
     QString escaped = Qt::escape(str);
+#else
+    QString escaped = str.toHtmlEscaped();
+#endif
     if(fMultiLine)
     {
         escaped = escaped.replace("\n", "<br>\n");
@@ -175,7 +188,11 @@
     QString myDir;
     if(dir.isEmpty()) // Default to user documents location
     {
+#if QT_VERSION < 0x050000
         myDir = QDesktopServices::storageLocation(QDesktopServices::DocumentsLocation);
+#else
+	myDir = QStandardPaths::writableLocation(QStandardPaths::DocumentsLocation);
+#endif
     }
     else
     {
@@ -474,4 +491,4 @@
     printf("SHGetSpecialFolderPathA() failed, could not obtain requested path.\n");
     return fs::path("");
 }
-#endif  
\ No newline at end of file
+#endif  
--- namecoin-nc0.3.75/src/qt/managenamespage.cpp
+++ namecoin-nc0.3.75.new/src/qt/managenamespage.cpp
@@ -162,8 +162,13 @@
     // Set column widths
     ui->tableView->horizontalHeader()->resizeSection(
             NameTableModel::Name, COLUMN_WIDTH_NAME);
+#if QT_VERSION < 0x050000
     ui->tableView->horizontalHeader()->setResizeMode(
             NameTableModel::Value, QHeaderView::Stretch);
+#else
+    ui->tableView->horizontalHeader()->setSectionResizeMode(
+            NameTableModel::Value, QHeaderView::Stretch);
+#endif
     ui->tableView->horizontalHeader()->resizeSection(
             NameTableModel::Address, COLUMN_WIDTH_ADDRESS);
     ui->tableView->horizontalHeader()->resizeSection(
--- namecoin-nc0.3.75/src/qt/overviewpage.cpp
+++ namecoin-nc0.3.75.new/src/qt/overviewpage.cpp
@@ -46,7 +46,11 @@
         bool confirmed = index.data(TransactionTableModel::ConfirmedRole).toBool();
         QVariant value = index.data(Qt::ForegroundRole);
         QColor foreground = option.palette.color(QPalette::Text);
+#if QT_VERSION < 0x050000
         if(qVariantCanConvert<QColor>(value))
+#else
+	if(value.canConvert(QMetaType::QColor))
+#endif
         {
             foreground = qvariant_cast<QColor>(value);
         }
--- namecoin-nc0.3.75/src/qt/sendcoinsdialog.cpp
+++ namecoin-nc0.3.75.new/src/qt/sendcoinsdialog.cpp
@@ -94,7 +94,11 @@
     QStringList formatted;
     foreach(const SendCoinsRecipient &rcp, recipients)
     {
+#if QT_VERSION < 0x050000
         formatted.append(tr("<b>%1</b> to %2 (%3)").arg(BitcoinUnits::formatWithUnit(BitcoinUnits::BTC, rcp.amount), Qt::escape(rcp.label), rcp.address));
+#else
+        formatted.append(tr("<b>%1</b> to %2 (%3)").arg(BitcoinUnits::formatWithUnit(BitcoinUnits::BTC, rcp.amount), rcp.label.toHtmlEscaped(), rcp.address));
+#endif
     }
 
     fNewRecipientAllowed = false;
--- namecoin-nc0.3.75/src/qt/transactionview.cpp
+++ namecoin-nc0.3.75.new/src/qt/transactionview.cpp
@@ -174,7 +174,11 @@
         transactionView->horizontalHeader()->resizeSection(TransactionTableModel::Status, 23);
         transactionView->horizontalHeader()->resizeSection(TransactionTableModel::Date, 120);
         transactionView->horizontalHeader()->resizeSection(TransactionTableModel::Type, 120);
+#if QT_VERSION < 0x050000
         transactionView->horizontalHeader()->setResizeMode(TransactionTableModel::ToAddress, QHeaderView::Stretch);
+#else
+        transactionView->horizontalHeader()->setSectionResizeMode(TransactionTableModel::ToAddress, QHeaderView::Stretch);
+#endif
         transactionView->horizontalHeader()->resizeSection(TransactionTableModel::Amount, 100);
     }
 }