created qzxing_qml and qzxing_multimedia qmake CONFIG tags for QZXing.pri to allow the control of dependencies based on the needs. qzxing_qml enables QML specific parts of the library. qzxing_multimedia enables QZXingFilter which requires Qt's multimedia.

examples/QZXingLive/QZXingLive.pro

@@ -1,8 +1,8 @@
 TEMPLATE = app
 
-QT += qml quick widgets multimedia
+QT += qml quick
 
-CONFIG += c++11
+CONFIG += c++11 qzxing_multimedia
 
 SOURCES += main.cpp
 

src/QZXing.h

@@ -73,12 +73,14 @@ public:
 
     QZXing(DecoderFormat decodeHints, QObject *parent = NULL);
 
+#ifdef QZXING_QML
+
 #if QT_VERSION >= 0x040700
     static void registerQMLTypes()
     {
         qmlRegisterType<QZXing>("QZXing", 2, 3, "QZXing");
     }
-#endif
+#endif //QT_VERSION >= Qt 4.7
 
 #if  QT_VERSION >= 0x050000
     static void registerQMLImageProvider(const QQuickView& view)
@@ -86,7 +88,9 @@ public:
         QQmlEngine *engine = view.engine();
         engine->addImageProvider(QLatin1String("QZXing"), QZXingImageProvider::getInstance());
     }
-#endif
+#endif //QT_VERSION >= Qt 5.0
+
+#endif //QZXING_QML
 
     void setTryHarder(bool tryHarder);
     bool getTryHarder();

src/QZXing.pri

@@ -1,7 +1,6 @@
-QT       += core gui widgets
+QT       += core gui
 
-greaterThan(QT_VERSION, 4.7): lessThan(QT_VERSION, 5.0): QT += declarative
-greaterThan(QT_MAJOR_VERSION, 4): QT += quick
+CONFIG += qzxing_qml
 
 DEFINES += QZXING_LIBRARY \
         ZXING_ICONV_CONST \
@@ -14,7 +13,6 @@ HEADERS += $$PWD/QZXing_global.h \
     $$PWD/CameraImageWrapper.h \
     $$PWD/imagehandler.h \
     $$PWD/QZXing.h \
-    $$PWD/QZXingFilter.h \
     $$PWD/zxing/zxing/ZXing.h \
     $$PWD/zxing/zxing/IllegalStateException.h \
     $$PWD/zxing/zxing/InvertedLuminanceSource.h \
@@ -134,13 +132,10 @@ HEADERS += $$PWD/QZXing_global.h \
     $$PWD/zxing/zxing/EncodeHint.h \
     $$PWD/zxing/zxing/UnsupportedEncodingException.h \
     $$PWD/zxing/zxing/common/reedsolomon/ReedSolomonEncoder.h \
-    $$PWD/zxing/zxing/common/Types.h \
-    $$PWD/QZXingImageProvider.h
+    $$PWD/zxing/zxing/common/Types.h
 
 SOURCES += $$PWD/CameraImageWrapper.cpp \
-    $$PWD/QZXingImageProvider.cpp\
     $$PWD/qzxing.cpp \
-    $$PWD/QZXingFilter.cpp \
     $$PWD/imagehandler.cpp \
     $$PWD/zxing/zxing/ResultIO.cpp \
     $$PWD/zxing/zxing/InvertedLuminanceSource.cpp \
@@ -250,6 +245,30 @@ SOURCES += $$PWD/CameraImageWrapper.cpp \
     $$PWD/zxing/zxing/EncodeHint.cpp \
     $$PWD/zxing/zxing/common/reedsolomon/ReedSolomonEncoder.cpp
 
+qzxing_qml {
+
+    greaterThan(QT_VERSION, 4.7): lessThan(QT_VERSION, 5.0): QT += declarative
+    greaterThan(QT_MAJOR_VERSION, 4): QT += quick
+
+    DEFINES += QZXING_QML
+
+    HEADERS +=  \
+        $$PWD/QZXingImageProvider.h
+
+    SOURCES +=  \
+        $$PWD/QZXingImageProvider.cpp
+}
+
+qzxing_multimedia {
+    QT += multimedia
+
+    HEADERS += \
+        $$PWD/QZXingFilter.h
+
+    SOURCES += \
+        $$PWD/QZXingFilter.cpp
+}
+
 symbian {
     TARGET.UID3 = 0xE618743C
     TARGET.EPOCALLOWDLLDATA = 1

src/imagehandler.cpp

@@ -1,8 +1,6 @@
 #include "imagehandler.h"
-#include <QGraphicsObject>
 #include <QImage>
 #include <QPainter>
-#include <QStyleOptionGraphicsItem>
 #include <QDebug>
 #include <QQuickItem>
 #include <QQuickItemGrabResult>
@@ -10,6 +8,11 @@
 #include <QThread>
 #include <QTime>
 
+#if QT_VERSION < 0x050000
+    #include <QGraphicsObject>
+    #include <QStyleOptionGraphicsItem>
+#endif // QT_VERSION < Qt 5.0
+
 ImageHandler::ImageHandler(QObject *parent) :
     QObject(parent)
 {

tests/src/QZXingTests/QZXingTests.pro

@@ -1,7 +1,5 @@
-QT += core
-QT -= gui
-
 CONFIG += gnu++11
+CONFIG -= qzxing_qml
 QMAKE_CXXFLAGS += -std=gnu++11
 
 TARGET = QZXingTests