Migration CMake projects from Qt4 to Qt5

[podsvirov]

As the QtCreator 2.7, I created a simple project "Migration" based on CMake.
I want to get Qt4/5 compatible file of the project.
I already have a prototype that I tested with Qt4/5 on Windows and Linux.
And it works on this little example.
But I want to get the comments to make the code better.

The project now consists of three files.

CMakeLists.txt:
@
project(Migration)

cmake_minimum_required(VERSION 2.8.9)

list(APPEND CMAKE_MODULE_PATH ${CMAKE_CURRENT_LIST_DIR})

aux_source_directory(. SRC_LIST)
add_executable(${PROJECT_NAME} ${SRC_LIST})

include(QtMigration)

QT_USE_MODULES(${PROJECT_NAME} Core Gui)
@

QtMigration.cmake:
@
cmake_minimum_required(VERSION 2.8.9)

macro(QT_USE_MODULES _target)
# Enable AUTOMOC
set_target_properties(${_target} PROPERTIES AUTOMOC TRUE)
# Local variables
set(_modules_qt4)
set(_modules_qt5)
# Prepare modules
foreach(_module ${ARGN})
list(APPEND _modules_qt4 Qt${_module})
list(APPEND _modules_qt5 ${_module})
if(_module MATCHES "Gui")
list(APPEND _modules_qt5 "Widgets")
endif(_module MATCHES "Gui")
endforeach(_module ${ARGN})
list(REMOVE_DUPLICATES _modules_qt4)
list(REMOVE_DUPLICATES _modules_qt5)
# Find Qt libraries
find_package(Qt5 QUIET COMPONENTS ${_modules_qt5})
if(Qt5_FOUND)
qt5_use_modules(${_target} ${_modules_qt5})
else(Qt5_FOUND)
find_package(Qt4 QUIET COMPONENTS ${_modules_qt4})
if(Qt4_FOUND OR QT4_FOUND)
include(${QT_USE_FILE})
include_directories(${QT_INCLUDES})
add_definitions(${QT_DEFINITIONS})
target_link_libraries(${_target} ${QT_LIBRARIES})
endif(Qt4_FOUND OR QT4_FOUND)
endif(Qt5_FOUND)
endmacro(QT_USE_MODULES)
@

And main.cpp:
@
#include <QApplication>
#include <QLabel>

int main(int argc, char *argv[])
{
QApplication app(argc, argv);

QLabel label(QString("Hello Qt%1!").arg(int(QT_VERSION >> 16)));
label.setAlignment(Qt::AlignCenter);
label.resize(200, 100);
label.show();

return app.exec();

}
@