我在用cmake编译是报错：
CMake Error at CMake/ctkMacroSetupQt.cmake:87(message):
error: Qt4 was not found on your system. You probably need to set the
QT_QMAKE_EXECUTABLE variable
有人说要修改CMake/ctkMacroSetupQt.cmake，将
set_property(CACHE CTK_QT_VERSION PROPERTY STRINGS 4 5)改成set_property(CACHE CTK_QT_VERSION PROPERTY STRINGS 5 4)
以及
set(CTK_QT_VERSION “4” CACHE STRING “Expected Qt version”)改为set(CTK_QT_VERSION “5” CACHE STRING “Expected Qt version”)
我修改之后还是报错，我谷歌后找到了不修改ctkMacroSetupQt的方法，具体如下：
1.点击Add Entry
2.添加
CTK_QT_VERSION (to 5)
CMAKE_PREFIX_PATH (with the path to the cmake folder in Qt)
3.点击主界面的Generate即可
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