cc -pipe -O   -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations stdatomic/atomic_flag_clear.c -o stdatomic/atomic_flag_clear -D_POSIX_C_SOURCE=202405L  -lm -lpthread -lrt  -lrt -lcrypt
../out/dragonfly/include/stdatomic/atomic_flag_clear.o:atomic_flag_clear.c:foo: error: undefined reference to 'atomic_flag_clear'
collect2: error: ld returned 1 exit status