clang -O2   -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations dirent/DT_SHM.c -o dirent/DT_SHM -D_POSIX_C_SOURCE=202405L  -lm   -lintl
dirent/DT_SHM.c:3:2: error: "DT_SHM is not defined"
#error "DT_SHM is not defined"
 ^
1 error generated.