cc -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations stdalign/alignof.c -o stdalign/alignof -D_POSIX_C_SOURCE=202405L -lm -lpthread -lrt -lcrypt -latomic
stdalign/alignof.c:3:2: error: #error "alignof is not defined"
    3 | #error "alignof is not defined"
      |  ^~~~~