qt配置opencv时，用到cmake，弹出窗口“Error in configuration process, project files may be invalid”错误，主窗口显示“CMake Error: CMake was unable to find a build program corresponding to "MinGW Makefiles". CMAKE_MAKE_PROGRAM is not set. You probably need to select a different build tool.”如下图：
上述错误源自没有找到正确的make工具。
解决如下图：
将CMAKE_MAKE_PROGRAM的值改为qt的mingw32-make.exe，configure即可。