The sample project attached to #25568 still does not build. The previous issues are solved, but the final application does not link with the following errors: ``` : && /usr/bin/clang-17 -O3 -DNDEBUG CMakeFiles/application.dir/Release/application.cpp.o -o Release/application /home/mpusz/repos/cmake_issue/local/lib/libmy_library.a && : /usr/bin/ld: CMakeFiles/application.dir/Release/application.cpp.o: in function `main': application.cpp:(.text+0x4): undefined reference to `std::cout' /usr/bin/ld: application.cpp:(.text+0xe): undefined reference to `std::ostream::operator<<(int)' /usr/bin/ld: application.cpp:(.text+0x22): undefined reference to `std::basic_ostream<char, std::char_traits<char> >& std::__ostream_insert<char, std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&, char const*, long)' clang-17: error: linker command failed with exit code 1 (use -v to see invocation) ninja: build stopped: subcommand failed. ``` Am I doing something wrong? --- Additionally, if I will comment out the following lines in the _my_library/CMakeLists.txt_ file: ```cmake target_include_directories(my_library PUBLIC $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include> $<INSTALL_INTERFACE:include> ) ``` I get the following error while compiling the application: ``` Error while scanning dependencies for /home/mpusz/repos/cmake_issue/local/lib/miu/my_library.cpp: /home/mpusz/repos/cmake_issue/local/lib/miu/my_library.cpp:7:10: fatal error: 'my_library/my_library.h' file not found ninja: build stopped: subcommand failed. ``` Do I understand correctly, that when `FILE_SET HEADERS` is installed then we do not have to provide `target_include_directories` for a target?