cc -pipe -O   -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations termios/CRDLY.c -o termios/CRDLY -D_POSIX_C_SOURCE=202405L  -lm -lpthread -lrt  -lrt -lcrypt
termios/CRDLY.c:8:17: error: 'CRDLY' undeclared here (not in a function)
 int const foo = CRDLY;
                 ^~~~~