install(TARGETS mylib mylib_shared EXPORT MyLibTargets ARCHIVE DESTINATION lib LIBRARY DESTINATION lib PUBLIC_HEADER DESTINATION include RUNTIME DESTINATION bin INCLUDES DESTINATION include)中PUBLIC_HEADER所代表的路径如何确定，举个例子

`PUBLIC_HEADER`选项所代表的路径是相对于安装目录的路径。在`install()`命令中，通过`PUBLIC_HEADER DESTINATION`选项来指定头文件的安装路径。例如，`PUBLIC_HEADER DESTINATION include`表示将头文件安装到`<prefix>/include`目录下，其中`<prefix>`是通过`CMAKE_INSTALL_PREFIX`选项设置的安装前缀。

举个例子，如果你在`CMakeLists.txt`文件中设置了以下内容：

install(TARGETS mylib
        EXPORT MyLibTargets
        ARCHIVE DESTINATION lib
        LIBRARY DESTINATION lib
        PUBLIC_HEADER DESTINATION include
        INCLUDES DESTINATION include)

install(EXPORT MyLibTargets
        FILE MyLibTargets.cmake
        NAMESPACE MyLib::
        DESTINATION lib/cmake/MyLib)

那么，当你执行`make install`命令时，CMake会将`mylib.h`头文件复制到`<prefix>/include`目录下，其中`<prefix>`是通过`CMAKE_INSTALL_PREFIX`选项设置的安装前缀。如果`CMAKE_INSTALL_PREFIX`选项设置为`/usr/local`，则`mylib.h`将会被安装到`/usr/local/include`目录下。

如果你想将`mylib.h`安装到`<prefix>/include/mylib`目录下，则可以将`PUBLIC_HEADER DESTINATION`选项设置为`include/mylib`。例如：

install(TARGETS mylib
        EXPORT MyLibTargets
        ARCHIVE DESTINATION lib
        LIBRARY DESTINATION lib
        PUBLIC_HEADER DESTINATION include/mylib
        INCLUDES DESTINATION include)

install(EXPORT MyLibTargets
        FILE MyLibTargets.cmake
        NAMESPACE MyLib::
        DESTINATION lib/cmake/MyLib)

注意，`PUBLIC_HEADER`选项只对静态库和动态库有效。如果你的库是一个可执行文件，则不需要使用`PUBLIC_HEADER`选项。