cc -O2 -pipe  -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations stdlib/at_quick_exit.c -o stdlib/at_quick_exit -D_POSIX_C_SOURCE=202405L  -lm -lpthread 
stdlib/at_quick_exit.c:5:30: error: use of undeclared identifier 'at_quick_exit'
int (*foo)(void (*)(void)) = at_quick_exit;
                             ^
1 error generated.