Why fix the path of qt in CmakeLists.txt ?

[QiuYilin]

if(CMAKE_SYSTEM_NAME MATCHES "Windows")
    set(QT_PATH I:\\Librarys\\Qt\\5.15.2\\mingw81_64\\lib\\cmake)
    set(CMAKE_PREFIX_PATH ${CMAKE_PREFIX_PATH} ${QT_PATH})
else()
    set(QT_DIR /opt/Qt5)
    #set(QT_DIR /opt/Qt5_GCC/5.15.2/gcc_64/)
    set(QT_PATH ${QT_DIR}/lib/cmake)
    set(CMAKE_PREFIX_PATH ${CMAKE_PREFIX_PATH} ${QT_PATH})
endif()

I think it can be simply written as

find_package(QT NAMES Qt6 Qt5 REQUIRED COMPONENTS Widgets )
find_package(Qt${QT_VERSION_MAJOR} REQUIRED COMPONENTS Widgets Network LinguistTools)
MESSAGE(STATUS "QT_VERSION_MAJOR: ${QT_VERSION_MAJOR}")

[filecxx]

musl libc -> set(QT_DIR /opt/Qt5)
glibc -> #set(QT_DIR /opt/Qt5_GCC/5.15.2/gcc_64/)

[QiuYilin]

@filecxx
What is the meaning ?

[filecxx]

@QiuYilin Just prevent CMake from using the wrong Qt version.