Brute-force fix; I cannot understand why GCC behaves in a complicated way, but there is a simple workaround

svn path=/nixpkgs/branches/stdenv-updates/; revision=24771

pkgs/development/libraries/opencv/changeset_r3190.diff

@@ -0,0 +1,20 @@
+--- opencv/src/highgui/cvcap_ffmpeg.cpp
++++ opencv/src/highgui/cvcap_ffmpeg.cpp
+@@ -49,6 +49,15 @@
+ #if !defined(WIN32) || defined(__MINGW32__)
+ // some versions of FFMPEG assume a C99 compiler, and don't define INT64_C
+-#ifndef INT64_C
+-#define INT64_C
++#if !defined INT64_C || !defined UINT64_C
++# if __WORDSIZE == 64
++#  define INT64_C(c)	c ## UL
++# else
++#  define INT64_C(c)	c ## ULL
++# endif
++# if __WORDSIZE == 64
++#  define UINT64_C(c)	c ## UL
++# else
++#  define UINT64_C(c)	c ## ULL
++# endif
+ #define __STDC_CONSTANT_MACROS
+ // force re-inclusion of stdint.h to get INT64_C macro

pkgs/development/libraries/opencv/default.nix

@@ -12,6 +12,8 @@ stdenv.mkDerivation rec {
   buildInputs = [ cmake gtk glib libjpeg libpng libtiff jasper ffmpeg pkgconfig
     xineLib gstreamer ];
 
+  patches = [ ./changeset_r3190.diff ];
+
   meta = {
     description = "Open Computer Vision Library with more than 500 algorithms";
     homepage = http://opencv.willowgarage.com/;