即使已安装qt5，也可以使用qt4强制编译

问题描述

我正在Ubuntu 14.04上安装qt4和qt5（从存储库中）。我以为我可以在使用qt5构建与使用qt4构建之间切换，只需使用

I'm on Ubuntu 14.04 and have both qt4 and qt5 installed (from the repositories). I thought I could switch between building with qt5 to building with qt4 simply with

sudo apt-get install qt4-default

但是该程序仍然使用Qt5生成并给出错误，因为它仅支持Qt4。

But the program still builds with Qt5 and gives error because it only supports Qt4.

我检查了qmake版本，安装了qt4-default后，它给出了

I checked the qmake version and after qt4-default is installed it gives

$ qmake --version
QMake version 2.01a
Using Qt version 4.8.6 in /usr/lib/x86_64-linux-gnu

我正在与CMake合作，以防万一。另外，如果我这样做

I'm building with CMake in case that is useful. Also, if I do

sudo apt-get remove qtbase5-dev

然后最终使用qt4进行构建。

then finally it builds with qt4.

编辑：我没有使用Qt Creator，而是希望使用命令行解决方案

I am not using Qt Creator and would prefer a command-line solution

推荐答案

您需要将其放入CMakeLists.txt：

You would need to put this into your CMakeLists.txt:

find_package(Qt4 REQUIRED)
...
include_directories(${QT_INCLUDES})
target_link_libraries(main ${QT_QTCORE_LIBRARY})

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