title: How does make track timestamps
body: <p>How does make keep timestamps for files? I am trying to put in place my git repo. I am adding precompiled binaries for files which are mostly not gonna change. Now, when I checkout repo from git then I dont want to compile these c files. I want to use these prebuilt binaries. So, to set up this scheme, I want to know how makefile tracks timestamps. Can anyone help me?</p>
  
  <p>Thanks</p>