# Pastebin x4Q6p2JU
(gdb) p clang_install_res_path
$1 = filesystem::path "/usr/lib/llvm-21/lib/clang/21/include" = {[root-directory] = "/", [1] = "usr", [2] = "lib", [3] = "llvm-21", 
  [4] = "lib", [5] = "clang", [6] = "21", [7] = "include"}
(gdb) 

root@glymur:~# ls /usr/lib/llvm-21/lib/clang/21/include/opencl-c-base.h 
/usr/lib/llvm-21/lib/clang/21/include/opencl-c-base.h