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