cc -pthread  -Wall -Wextra at_quick_exit.c -o at_quick_exit -D_GNU_SOURCE -D_BSD_SOURCE -D_ALL_SOURCE -D_DEFAULT_SOURCE  -lm -lpthread  -liconv
at_quick_exit.c:14:7: error: implicit declaration of function 'at_quick_exit' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
        if ( at_quick_exit(handler) )
             ^
at_quick_exit.c:16:2: error: implicit declaration of function 'quick_exit' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
        quick_exit(1);
        ^
at_quick_exit.c:16:2: note: did you mean 'at_quick_exit'?
at_quick_exit.c:14:7: note: 'at_quick_exit' declared here
        if ( at_quick_exit(handler) )
             ^
2 errors generated.