clang -O2  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations math/M_1_SQRTPI.c -o math/M_1_SQRTPI -D_POSIX_C_SOURCE=202405L  -lm  -lintl
math/M_1_SQRTPI.c:8:21: error: use of undeclared identifier 'M_1_SQRTPI'
double  const foo = M_1_SQRTPI;
                    ^
1 error generated.