cc -pthread -Wall -Wextra -Werror=implicit-function-declaration stdlib/quick_exit.c -o stdlib/quick_exit -D_GNU_SOURCE -D_BSD_SOURCE -D_ALL_SOURCE -D_DEFAULT_SOURCE -lm -lpthread -lnetwork -lbsd -latomic stdlib/quick_exit.c: In function 'main': stdlib/quick_exit.c:9:9: error: implicit declaration of function 'quick_exit' [-Werror=implicit-function-declaration] 9 | quick_exit(0); | ^~~~~~~~~~ cc1: some warnings being treated as errors