title: #error you must define the platform macro
body: <p>I have a project that I compile and it gives me following errors as:</p>
  
  <pre><code>In file included from c:/acrobatxsdk/Adobe/Acrobat 10 SDK/Version 1/PluginSupport/Headers/API/PIMain.c:21:0:
  c:/acrobatxsdk/Adobe/Acrobat 10 SDK/Version 1/PluginSupport/Headers/API/Environ.h:37:2: error: #error You must define the PLATFORM macro
  c:/acrobatxsdk/Adobe/Acrobat 10 SDK/Version 1/PluginSupport/Headers/API/Environ.h:41:10: error: #include expects "FILENAME" or &lt;FILENAME&gt;
  c:/acrobatxsdk/Adobe/Acrobat 10 SDK/Version 1/PluginSupport/Headers/API/Environ.h:52:2: error: #error PLATFORM failed to #define ACCB1
  </code></pre>
  
  <p>The PIMain.c looks like this :</p>
  
  <pre><code>#if WIN_PLATFORM
  #include "WinCalls.h"
  #elif MAC_PLATFORM
  #include "MacCalls.h"
  #elif UNIX_PLATFORM
  #include "UnixCalls.h"
  #else
  #error platform not defined
  #endif
  </code></pre>
  
  <p>I have come to know that the only amendment if required is to be made in Environ.h , can some one suggest how?</p>