gcc animation.c -o animation
animation.c:4:19: error: stdio.h: No such file or directory
animation.c:5:20: error: unistd.h: No such file or directory
animation.c:7: error: syntax error before __useconds
animation.c: In function main:
animation.c:22: error: stdout undeclared (first use in this function)
animation.c:22: error: (Each undeclared identifier is reported only once
animation.c:22: error: for each function it appears in.)
animation.c:23: warning: incompatible implicit declaration of built-in function fprintf