warning: incompatible implicit declaration

test.c: In function 'main':
test.c:181: warning: incompatible implicit declaration of built-in function 'exit'
rm test.lis
rm test.c

stdlib.h을 include 하니까 없어지더군요 -0-;
strcpy 도 저런거 뜨길래. string.h 넣으니 없어진다는..