title: Does "make install", by convention, updates the targets it installs?
body: <p>You usually invoke the following commands to build a <code>./configure</code>d product:</p>
  
  <pre><code>make
  make install
  </code></pre>
  
  <p>Okay, the product is in the system now.  Then you change some source code files and invoke only <code>make install</code>.  The question is, does the conventional implementation of <code>install</code> target requires the executables to be recompiled, or just the old ones should be copied to the appropriate system path?</p>