* QA Notice: Package has poor programming practices which may compile
 *            fine but exhibit random runtime failures.
 * main.c:220: warning: incompatible implicit declaration of built-in function 'round'
 * main.c:762: warning: incompatible implicit declaration of built-in function 'round'
 * main.c:782: warning: incompatible implicit declaration of built-in function 'round'

looks like someone forgot to include math.h