cc -pipe -O   -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations unistd/_SC_DEVICE_CONTROL.c -o unistd/_SC_DEVICE_CONTROL -D_POSIX_C_SOURCE=202405L  -lm -lpthread -lrt  -lrt -lcrypt
unistd/_SC_DEVICE_CONTROL.c:2:17: error: '_SC_DEVICE_CONTROL' undeclared here (not in a function)
 int const foo = _SC_DEVICE_CONTROL;
                 ^~~~~~~~~~~~~~~~~~