如何修复“无法加载 Qt 平台插件“xcb"?在“"中即使它被发现了.在 fixup_bundle 宏之后?

ldd <path_to_project>/build/install/platforms/libqxcb.so shows it links to the system Qt library, which is not the one my project built against on:

./platforms/libqxcb.so: /lib64/libQt5XcbQpa.so.5: version `Qt_5_PRIVATE_API' not found (required by ./platforms/libqxcb.so)
./platforms/libqxcb.so: /lib64/libQt5Gui.so.5: version `Qt_5_PRIVATE_API' not found (required by ./platforms/libqxcb.so)
        libQt5XcbQpa.so.5 => /lib64/libQt5XcbQpa.so.5 (0x00007f1d8ea75000)
        libQt5Gui.so.5 => /lib64/libQt5Gui.so.5 (0x00007f1d8e41e000)
        libQt5DBus.so.5 => /lib64/libQt5DBus.so.5 (0x00007f1d8e382000)
        libQt5Core.so.5 => /lib64/libQt5Core.so.5 (0x00007f1d8de62000)
......
        libicui18n.so.63 => /lib64/libicui18n.so.63 (0x00007f1d8cf37000)
        libicuuc.so.63 => /lib64/libicuuc.so.63 (0x00007f1d8cd64000)
        libicudata.so.63 => /lib64/libicudata.so.63 (0x00007f1d8afd0000)
......

源代码

CMakeLists.txt

cmake_minimum_required(VERSION 3.10 FATAL_ERROR)

project(OpenGLUnderQML LANGUAGES CXX)

set(CMAKE_PREFIX_PATH "$ENV{HOME}/Qt5.12.2/5.12.2/gcc_64/lib/cmake")
set(qt_lib_path "$ENV{HOME}/Qt5.12.2/5.12.2/gcc_64")

list(APPEND qt_modules
    Core
    Gui
    Quick
    DBus
)

foreach(module ${qt_modules})
    list(APPEND qt_libs "Qt5::${module}")
endforeach()

include(GNUInstallDirs)
set(CMAKE_LIBRARY_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/${CMAKE_INSTALL_LIBDIR}")
set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/${CMAKE_INSTALL_LIBDIR}")
set(CMAKE_RUNTIME_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/${CMAKE_INSTALL_BINDIR}")


find_package(Qt5 COMPONENTS ${qt_modules} REQUIRED)

set(CMAKE_INCLUDE_CURRENT_DIR ON)
set(CMAKE_AUTOMOC ON)
set(CMAKE_AUTORCC ON)

include_directories(include/)

list(APPEND headers
    include/Scene.hpp
    include/Renderer.hpp
    include/VertexArray.hpp
    include/VertexBuffer.hpp
    include/VertexLayout.hpp
    include/IndexBuffer.hpp
    include/Shader.hpp
)

list(APPEND qrc
    qml/qml.qrc
    res/fonts.qrc
    res/shaders.qrc
)

add_executable(${PROJECT_NAME}
    src/main.cpp
    src/Scene.cpp
    src/Renderer.cpp
    src/VertexArray.cpp
    src/VertexBuffer.cpp
    src/VertexLayout.cpp
    src/IndexBuffer.cpp
    src/Shader.cpp
    ${headers}
    ${qrc}
)

target_link_libraries(${PROJECT_NAME}
    PUBLIC
        ${qt_libs}
)


file(RELATIVE_PATH _rel "${CMAKE_INSTALL_PREFIX}/install" "${CMAKE_INSTALL_PREFIX}")
set(_rpath "$ORIGIN/${_rel}")
file(TO_NATIVE_PATH "${_rpath}/install" app_RPATH)

set_target_properties(${PROJECT_NAME}
    PROPERTIES
        SKIP_BUILD_RPATH OFF
        BUILD_WITH_INSTALL_RPATH OFF
        INSTALL_RPATH ${app_RPATH}
        INSTALL_RPATH_USE_LINK_PATH ON
)

install(TARGETS ${PROJECT_NAME} DESTINATION ${CMAKE_BINARY_DIR}/install)
install(
    CODE "
include(BundleUtilities)
fixup_bundle("${CMAKE_BINARY_DIR}/install/${PROJECT_NAME}" "" "")
"
    DESTINATION ${CMAKE_BINARY_DIR}/install
    COMPONENT Runtime
)

install(FILES "$<TARGET_FILE:Qt5::QXcbIntegrationPlugin>" DESTINATION ${CMAKE_BINARY_DIR}/install/platforms)

qt.conf

[Paths]
Prefix = ./
Plugins = /home/giokka/qt/5.12.2/gcc_64/plugins

更新01:

这是我的 qt.conf 文件，但它不起作用.

[Paths]
Prefix = .
Libraries = lib
Qml2Imports = qml
Plugins = plugins

export LD_LIBRARY_PATH=`pwd`/lib
export QML_IMPORT_PATH=`pwd`/qml
export QML2_IMPORT_PATH=`pwd`/qml
export QT_QPA_PLATFORM_PLUGIN_PATH=`pwd`/plugins/platforms
./OpenGLUnderQML

lib
OpenGLUnderQML (the executable)
plugins
qml
qt.conf
startapp.sh (the script above)