CMakeList.txt里修改:
set(QT_VERSION 5)
set(CMAKE_INCLUDE_CURRENT_DIR ON)
set(Qt5_DIR "C:\\Qt\\5.15.1\\msvc2019\\lib\\cmake\\Qt5")
set(CMAKE_PREFIX_PATH "C:\\Qt\\Qt5.15.1\\msvc2019")
set(REQUIRED_LIBS Core Gui Widgets)
set(REQUIRED_LIBS_QUALIFIED Qt5::Core Qt5::Gui Qt5::Widgets)
原文:https://www.cnblogs.com/horizonhz/p/14181198.html