cc -O2 -pipe  -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations stdlib/quick_exit.c -o stdlib/quick_exit -D_POSIX_C_SOURCE=202405L  -lm -lpthread 
stdlib/quick_exit.c:5:21: error: use of undeclared identifier 'quick_exit'
 void (*foo)(int) = quick_exit;
                    ^
1 error generated.