clang -O2  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations stdalign/alignof.c -o stdalign/alignof -D_POSIX_C_SOURCE=202405L  -lm  -lintl
stdalign/alignof.c:1:10: fatal error: 'stdalign.h' file not found
#include <stdalign.h>
         ^
1 error generated.