[qt] Fixed compilation

platform/platform_tests/platform_tests.pro

@@ -19,7 +19,7 @@ win32* {
   win32-g++: LIBS *= -lpthread
 }
 macx-* {
-  QT *= widgets # needed for QApplication with event loop, to test async events (downloader, etc.)
+  QT *= gui widgets # needed for QApplication with event loop, to test async events (downloader, etc.)
   LIBS *= "-framework Foundation" "-framework IOKit" "-framework QuartzCore"
 }
 win32*|linux* {

qt/qt.pro

@@ -9,7 +9,7 @@ include($$ROOT_DIR/common.pri)
 TARGET = MapsWithMe
 TEMPLATE = app
 
-QT *= core gui opengl
+QT *= core widgets gui opengl
 
 win32* {
   LIBS += -lopengl32 -lws2_32 -lshell32 -liphlpapi

testing/testingmain.cpp

@@ -8,8 +8,13 @@
 #include "../std/target_os.hpp"
 
 #ifdef OMIM_UNIT_TEST_WITH_QT_EVENT_LOOP
+  #include <Qt>
   #ifdef OMIM_OS_MAC // on Mac OS X native run loop works only for QApplication :(
-    #include <QtWidgets/QApplication>
+    #if QT_VERSION < QT_VERSION_CHECK(5, 0, 0)
+      #include <QtGui/QApplication>
+    #else
+      #include <QtWidgets/QApplication>
+    #endif
     #define QAPP QApplication
   #else
     #include <QtCore/QCoreApplication>