clang -O2  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations termios/BS1.c -o termios/BS1 -D_POSIX_C_SOURCE=202405L  -lm  -lintl
termios/BS1.c:8:17: error: use of undeclared identifier 'BS1'
int const foo = BS1;
                ^
1 error generated.