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