Hi all,

I include <math.h> to use functions such as "floor()". and also I use -lm to link to math library like the following:

Code:
all: setitimer-helper squish-pty squish-unix

CC = gcc
CFLAGS = -Wall -W
LDFLAGS = -lm
setitimer-helper: setitimer-helper.o
squish-pty: squish-pty.o
squish-unix: squish-unix.o

clean: 
    rm -f *.o setitimer-helper
...