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