title: Working in separate prefix in Linux
body: <p>I'm downloading on open source Linux tool and trying to build it.</p>
  
  <p>The build guide says that I need to work in a separate prefix to avoid corrupting the system. For that I have created a my_prefix dir and written a setup-env file in it, its as follows : setup-env</p>
  
  <pre><code>    PROJECT=~/my_prefix
      export PATH=$PROJECT/install/bin:$PATH
      export LD_LIBRARY_PATH=$PROJECT/install/lib:$PATH
      export PKG_CONFIG_PATH=$PROJECT/install/lib/pkgconfig:$PKG_CONFIG_PATH
      export AC_LOCAL_FLAGS="-I $PROJECT/install/share/aclocal $ACLOCAL_FLAG"
  </code></pre>
  
  <p>After this I do source setup-env</p>
  
  <p>Now whenever I install a new tool using, sudo apt-get install, it should go into my new install dir, but its getting updated in /usr/bin only.</p>
  
  <p>Any idea what could be the reason?</p>