1.为什么CMAKE_FRAMEWORK_PATH是一个空字符串（应该是吗？））
一般来说，是的，它应该是空的。如果您在非标准位置安装了框架，则只需要设置CMAKE_FRAMEWORK_PATH。
为什么即使指定了frameworks文件夹，CMake也找不到OpenGL头文件
/System/Library/Frameworks不是头文件所在的位置。它们位于您的目标SDK中，为此您需要安装XCode或命令行工具。

$ find /System/Library/Frameworks/ -name gl.h
$ find /Library/Developer/CommandLineTools/SDKs/MacOSX13.1.sdk/ -name gl.h
/Library/Developer/CommandLineTools/SDKs/MacOSX13.1.sdk//System/Library/Frameworks/OpenGL.framework/Versions/A/Headers/gl.h

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基本CMakeLists.txt

cmake_minimum_required(VERSION 3.27.0 FATAL_ERROR)
include(CMakePrintHelpers)
project(t)

cmake_print_variables(OPENGL_gl_LIBRARY)
cmake_print_variables(OPENGL_INCLUDE_DIR)
cmake_print_variables(CMAKE_FRAMEWORK_PATH)
find_package(OpenGL)
cmake_print_variables(OPENGL_gl_LIBRARY)
cmake_print_variables(OPENGL_INCLUDE_DIR)
cmake_print_variables(CMAKE_FRAMEWORK_PATH)

型
你会得到：

$ rm -rf CMakeCache.txt CMakeFiles/; cmake --version ; cmake .
cmake version 3.27.0

CMake suite maintained and supported by Kitware (kitware.com/cmake).
-- The C compiler identification is AppleClang 14.0.0.14000029
-- The CXX compiler identification is AppleClang 14.0.0.14000029
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: /Library/Developer/CommandLineTools/usr/bin/cc - skipped
-- Detecting C compile features
-- Detecting C compile features - done
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: /Library/Developer/CommandLineTools/usr/bin/c++ - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- OPENGL_gl_LIBRARY=""
-- OPENGL_INCLUDE_DIR=""
-- CMAKE_FRAMEWORK_PATH=""
-- Found OpenGL: /Library/Developer/CommandLineTools/SDKs/MacOSX13.1.sdk/System/Library/Frameworks/OpenGL.framework
-- OPENGL_gl_LIBRARY="/Library/Developer/CommandLineTools/SDKs/MacOSX13.1.sdk/System/Library/Frameworks/OpenGL.framework"
-- OPENGL_INCLUDE_DIR="/Library/Developer/CommandLineTools/SDKs/MacOSX13.1.sdk/System/Library/Frameworks/OpenGL.framework"
-- CMAKE_FRAMEWORK_PATH=""
-- Configuring done (0.5s)
-- Generating done (0.0s)
-- Build files have been written to: /tmp

$

型

问题是我试图在CMakeLists.txt中的项目之前调用find_package
以这种方式重新排序代码行：

project("name")
find_package(OpenGL REQUIRED)

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解决了我的问题