title: Develop both 32 and 64bit OpenGL app on Ubuntu
body: <p>I want to develop both 32 and 64bit lib, which depends on OpenGL(mesa) on Ubuntu (64-bit).</p>
  
  <p>However it seems to be impossible to install both 32 and 64bit version of libgl1-mesa-dev.
  When I <code>sudo apt-get install libgl1-mesa-dev</code>, it install the 64-bit version. After that I <code>sudo apt-get install libgl1-mesa-dev:i386</code>, it will install 32-bit version but will uninstall the 64-bit one.</p>
  
  <p>Is it possible to let 32 and 64bit version of libgl1-mesa-dev co-exist? Or any alternative method I can try?</p>