title: Cannot open include file: 'pnglibconf.h':No such file or directory
body: <p>I'm trying to build <code>libpng</code> in MS Visual studio 2015 community edition but when i built it, i got this error (i used cmake to compile <a href="https://sourceforge.net/projects/libpng/?source=typ_redirect" rel="nofollow noreferrer">libpng</a> along with compiled <a href="https://sourceforge.net/projects/libpng/files/zlib/1.2.8/zlib-1.2.8.tar.gz/download?use_mirror=excellmedia&amp;download=" rel="nofollow noreferrer">zlib</a> to produce libpng's soln file <code>ALL_BUILD.vcxproj</code> )</p>
  
  <blockquote>
    <p>Cannot open include file: 'pnglibconf.h':No such file or directory</p>
  </blockquote>
  
  <p>I think this a system specific error,when i try to build this on other system  it works fine(because pnglibconfig.h was present with MS VS soln folder).<Br> Is there any prerequisites that is missing?<Br><Br> <strong>Update:</strong> I tried building libpng in both debug &amp; release mode, both are showing the same error. Zlib builds fine.</p>