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/usr/src/castle-game-engine-4.1.1/images/pngconf.inc is in castle-game-engine-src 4.1.1-1.

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{ Include file for PNG library.
  This defines symbol LIBPNG_CDECL or LIBPNG_STDCALL to
  determine calling convention of libpng funcs and callbacks.

  Right now, it's trivial, as all distributed versions (also under Windows)
  use cdecl. }

{$ifdef MSWINDOWS}
  {$define LIBPNG_CDECL}
{$else}
  {$define LIBPNG_CDECL}
{$endif}