我试图构建一个集成OR-Tools的项目，使用Qt Creator中的MSCV 2019，但有奇怪的构建错误（目前在Abseil源代码中有数百个，但可能只是因为它是先构建的）：

C：\我的项目\建设_部门\absl-src\absl\时间\时间.h：110：错误：C2039：'ratio'：不是'std'的成员
C：\程序文件（x86）\Microsoft Visual Studio \2019\社区\VC\工具\MSVC\14.29.30133\包含\算法（40）：注意：请参阅'std'的宣告
C：\我的项目\建设_部门\absl-src\absl\时间\时间.h：110：错误：C2061：语法错误：标识符'比率'
408：我的项目是什么？408：错误：C2760：语法错误：未预期的词语基元'{'，必须是'）'
我使用FetchContent获取OR-Tools，并使用下面的CMakeLists.txt（我已经删除了大部分默认的Qt样板文件）：

cmake_minimum_required(VERSION 3.15)

project(MyProject VERSION 0.1 LANGUAGES CXX)

set(CMAKE_INCLUDE_CURRENT_DIR ON)

set(CMAKE_CXX_STANDARD 20)
set(CMAKE_CXX_STANDARD_REQUIRED ON)

find_package(QT NAMES Qt6 Qt5 REQUIRED COMPONENTS Widgets LinguistTools)
find_package(Qt${QT_VERSION_MAJOR} REQUIRED COMPONENTS Widgets LinguistTools)

set(PROJECT_SOURCES main.cpp)

qt_add_executable(${PROJECT_NAME}
    MANUAL_FINALIZATION
    ${PROJECT_SOURCES}
)

target_link_libraries(${PROJECT_NAME} PRIVATE Qt${QT_VERSION_MAJOR}::Widgets)

include(FetchContent)
set(BUILD_DEPS ON)
set(BUILD_SAMPLES OFF)
set(BUILD_EXAMPLES OFF)
FetchContent_Declare(
    or-tools
    GIT_REPOSITORY https://github.com/google/or-tools.git
    GIT_TAG        v9.3
)
FetchContent_MakeAvailable(or-tools)
target_link_libraries(${PROJECT_NAME} PRIVATE or-tools)

target_compile_options(${PROJECT_NAME} PRIVATE /W4 /WX)
target_compile_options(${PROJECT_NAME} PRIVATE /experimental:external /external:anglebrackets /external:W0)

qt_finalize_executable(${PROJECT_NAME})

有关信息，Qt Creator将依次调用：

C:\Qt\Tools\CMake_64\bin\cmake.exe -S "C:/MyProject" -B "C:/MyProject/build" "-DCMAKE_GENERATOR:STRING=Ninja" "-DCMAKE_BUILD_TYPE:STRING=Debug" "-DCMAKE_PROJECT_INCLUDE_BEFORE:FILEPATH=C:/Qt/Tools/QtCreator/share/qtcreator/package-manager/auto-setup.cmake" "-DQT_QMAKE_EXECUTABLE:FILEPATH=C:/Qt/6.3.0/msvc2019_64/bin/qmake.exe" "-DCMAKE_PREFIX_PATH:PATH=C:/Qt/6.3.0/msvc2019_64" "-DCMAKE_C_COMPILER:FILEPATH=C:/Program Files (x86)/Microsoft Visual Studio/2019/Community/VC/Tools/MSVC/14.29.30133/bin/HostX64/x64/cl.exe" "-DCMAKE_CXX_COMPILER:FILEPATH=C:/Program Files (x86)/Microsoft Visual Studio/2019/Community/VC/Tools/MSVC/14.29.30133/bin/HostX64/x64/cl.exe"
C:\Qt\Tools\CMake_64\bin\cmake.exe --build "C:/MyProject/build" --target all

第一个失败的编译命令是：

C:\MSVC\x64\cl.exe /nologo /TP
-I"C:\MyProject\build\_deps\absl-build\absl\time"
-I"C:\MyProject\build\_deps\absl-src\absl\time"
-I"C:\MyProject\build\_deps\absl-build\absl\time\time_zone_autogen\include"
-I"C:\MyProject\build\_deps\absl-src"
/DWIN32 /D_WINDOWS /GR /EHsc /Zi /Ob0 /Od /RTC1 -MDd /W3 /DNOMINMAX
/DWIN32_LEAN_AND_MEAN /D_CRT_SECURE_NO_WARNINGS /D_SCL_SECURE_NO_WARNINGS /D_ENABLE_EXTENDED_ALIGNED_STORAGE
/bigobj /wd4005 /wd4068 /wd4180 /wd4244 /wd4267 /wd4503 /wd4800 -std:c++20 /showIncludes
/Fo_deps\absl-build\absl\time\CMakeFiles\time_zone.dir\internal\cctz\src\time_zone_lookup.cc.obj
/Fd_deps\absl-build\absl\time\CMakeFiles\time_zone.dir\time_zone.pdb
/FS -c "C:\MyProject\build\_deps\absl-src\absl\time\internal\cctz\src\time_zone_lookup.cc

我错过了什么吗？