title: Getting undefined reference to `floor' on running make in PintOS
body: <p>I am trying to run make on a PintOS makefile but I keep getting the undefined reference to `floor' error. The makefile is below. I am running Ubuntu 11.10 with gcc 4.6.1. Any help is appreciated.</p>
  
  <pre><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 squish-pty squish-unix
  </code></pre>
  
  <p>~     </p>