diff --git a/CMakeLists.txt b/CMakeLists.txt
index c3a2b8740..7b7f783b9 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -19,6 +19,7 @@ option(USE_LIBGIT23_API "allow building with libgit2 master" OFF)
 option(FORCE_LIBSSH "force linking with libssh to workaround libgit2 bug" ON)
 option(SUBSURFACE_MOBILE "build the QtQuick version for mobile device" OFF)
 option(FBSUPPORT "allow posting to Facebook" ON)
+option(BTSUPPORT "enable support for QtBluetooth (requires Qt5.4 or newer)" ON)
 
 set(CMAKE_MODULE_PATH
 	${CMAKE_MODULE_PATH}
@@ -177,6 +178,11 @@ find_package(Qt5 REQUIRED COMPONENTS Core Concurrent Widgets Network ${WEBKIT_PK
 set(QT_LIBRARIES Qt5::Core Qt5::Concurrent Qt5::Widgets Qt5::Network ${WEBKIT_LIB} ${PRINTING_LIB} Qt5::Svg ${QT_QUICK_LIB} ${ANDROID_LIB} Qt5::Bluetooth)
 set(QT_TEST_LIBRARIES ${QT_LIBRARIES} Qt5::Test)
 
+if ("${Qt5Core_VERSION_STRING}" STRLESS "5.4.0")
+	set(BTSUPPORT OFF)
+	message(STATUS "Turning off Bluetooth support as Qt version ${Qt5Core_VERSION_STRING} is insufficiant for that")
+endif()
+
 # Generate the ssrf-config.h every 'make'
 file(WRITE ${CMAKE_BINARY_DIR}/version.h.in
 "#define VERSION_STRING \"@VERSION_STRING@\"
@@ -331,6 +337,11 @@ if(FBSUPPORT)
 	set(SOCIALNETWORKS qt-ui/socialnetworks.cpp)
 endif()
 
+if(BTSUPPORT)
+	add_definitions(-DBT_SUPPORT)
+	set(BT_SRC_FILES qt-ui/btdeviceselectiondialog.cpp)
+endif()
+
 # the data models that will interface
 # with the views.
 set(SUBSURFACE_MODELS_LIB_SRCS
@@ -360,7 +371,6 @@ source_group("Subsurface Models" FILES ${SUBSURFACE_MODELS})
 set(SUBSURFACE_INTERFACE
 	qt-ui/updatemanager.cpp
 	qt-ui/about.cpp
-	qt-ui/btdeviceselectiondialog.cpp
 	qt-ui/divecomputermanagementdialog.cpp
 	qt-ui/divelistview.cpp
 	qt-ui/diveplanner.cpp
@@ -392,6 +402,7 @@ set(SUBSURFACE_INTERFACE
 	qt-ui/qtwaitingspinner.cpp
 	${SUBSURFACE_PRINTING_SRCS}
 	${SOCIALNETWORKS}
+	${BT_SRC_FILES}
 )
 source_group("Subsurface Interface" FILES ${SUBSURFACE_INTERFACE})
 
diff --git a/qt-ui/btdeviceselectiondialog.cpp b/qt-ui/btdeviceselectiondialog.cpp
index e883536cd..007fe940e 100644
--- a/qt-ui/btdeviceselectiondialog.cpp
+++ b/qt-ui/btdeviceselectiondialog.cpp
@@ -362,7 +362,6 @@ void BtDeviceSelectionDialog::initializeDeviceDiscoveryAgent()
 	// Intialize the discovery agent
 	remoteDeviceDiscoveryAgent = new QBluetoothDeviceDiscoveryAgent(localDevice->address());
 
-#if QT_VERSION >= 0x050300
 	// Test if the discovery agent was successfully created
 	if (remoteDeviceDiscoveryAgent->error() == QBluetoothDeviceDiscoveryAgent::InvalidBluetoothAdapterError) {
 		ui->dialogStatus->setText(QString("The device discovery agent was not created because the %1 address does not "
@@ -372,7 +371,6 @@ void BtDeviceSelectionDialog::initializeDeviceDiscoveryAgent()
 		ui->clear->setEnabled(false);
 		return;
 	}
-#endif
 
 	connect(remoteDeviceDiscoveryAgent, SIGNAL(deviceDiscovered(QBluetoothDeviceInfo)),
 		this, SLOT(addRemoteDevice(QBluetoothDeviceInfo)));
diff --git a/qt-ui/downloadfromdivecomputer.cpp b/qt-ui/downloadfromdivecomputer.cpp
index 276e4047c..4127376ac 100644
--- a/qt-ui/downloadfromdivecomputer.cpp
+++ b/qt-ui/downloadfromdivecomputer.cpp
@@ -100,10 +100,15 @@ DownloadFromDCWidget::DownloadFromDCWidget(QWidget *parent, Qt::WindowFlags f) :
 	ui.downloadCancelRetryButton->setEnabled(true);
 	ui.downloadCancelRetryButton->setText(tr("Download"));
 
+#if defined(BT_SUPPORT)
 	btDeviceSelectionDialog = 0;
 	ui.chooseBluetoothDevice->setEnabled(ui.bluetoothMode->isChecked());
 	connect(ui.bluetoothMode, SIGNAL(stateChanged(int)), this, SLOT(enableBluetoothMode(int)));
 	connect(ui.chooseBluetoothDevice, SIGNAL(clicked()), this, SLOT(selectRemoteBluetoothDevice()));
+#else
+	ui.bluetoothMode->hide();
+	ui.chooseBluetoothDevice->hide();
+#endif
 }
 
 void DownloadFromDCWidget::updateProgressBar()
@@ -313,11 +318,15 @@ void DownloadFromDCWidget::on_downloadCancelRetryButton_clicked()
 
 	data.vendor = strdup(ui.vendor->currentText().toUtf8().data());
 	data.product = strdup(ui.product->currentText().toUtf8().data());
+#if defined(BT_SUPPORT)
 	data.bluetooth_mode = ui.bluetoothMode->isChecked();
 	if (data.bluetooth_mode) {
 		// Get the selected device address
 		data.devname = strdup(btDeviceSelectionDialog->getSelectedDeviceAddress().toUtf8().data());
-	} else if (same_string(data.vendor, "Uemis")) {
+	} else
+		// this breaks an "else if" across lines... not happy...
+#endif
+	if (same_string(data.vendor, "Uemis")) {
 		char *colon;
 		char *devname = strdup(ui.device->currentText().toUtf8().data());
 
@@ -523,10 +532,13 @@ void DownloadFromDCWidget::markChildrenAsEnabled()
 	ui.chooseDumpFile->setEnabled(true);
 	ui.selectAllButton->setEnabled(true);
 	ui.unselectAllButton->setEnabled(true);
+#if defined(BT_SUPPORT)
 	ui.bluetoothMode->setEnabled(true);
 	ui.chooseBluetoothDevice->setEnabled(true);
+#endif
 }
 
+#if defined(BT_SUPPORT)
 void DownloadFromDCWidget::selectRemoteBluetoothDevice()
 {
 	if (!btDeviceSelectionDialog) {
@@ -555,6 +567,7 @@ void DownloadFromDCWidget::enableBluetoothMode(int state)
 	if (state == Qt::Checked)
 		selectRemoteBluetoothDevice();
 }
+#endif
 
 static void fillDeviceList(const char *name, void *data)
 {
diff --git a/qt-ui/downloadfromdivecomputer.h b/qt-ui/downloadfromdivecomputer.h
index 734e5f7d1..7acd49e95 100644
--- a/qt-ui/downloadfromdivecomputer.h
+++ b/qt-ui/downloadfromdivecomputer.h
@@ -10,7 +10,10 @@
 #include "libdivecomputer.h"
 #include "configuredivecomputerdialog.h"
 #include "ui_downloadfromdivecomputer.h"
+
+#if defined(BT_SUPPORT)
 #include "btdeviceselectiondialog.h"
+#endif
 
 class QStringListModel;
 
@@ -78,12 +81,13 @@ slots:
 	void updateProgressBar();
 	void checkLogFile(int state);
 	void checkDumpFile(int state);
-	void enableBluetoothMode(int state);
 	void pickDumpFile();
 	void pickLogFile();
+#if defined(BT_SUPPORT)
+	void enableBluetoothMode(int state);
 	void selectRemoteBluetoothDevice();
 	void bluetoothSelectionDialogIsFinished(int result);
-
+#endif
 private:
 	void markChildrenAsDisabled();
 	void markChildrenAsEnabled();
@@ -108,7 +112,9 @@ private:
 	bool dumpWarningShown;
 	OstcFirmwareCheck *ostcFirmwareCheck;
 	DiveImportedModel *diveImportedModel;
+#if defined(BT_SUPPORT)
 	BtDeviceSelectionDialog *btDeviceSelectionDialog;
+#endif
 
 public:
 	bool preferDownloaded();