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diff -up blender-2.64/intern/cycles/util/util_cuda.h.64bit blender-2.64/intern/cycles/util/util_cuda.h
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--- blender-2.64/intern/cycles/util/util_cuda.h.64bit	2012-10-05 17:34:55.000000000 +0200
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+++ blender-2.64/intern/cycles/util/util_cuda.h	2012-10-05 17:35:15.000000000 +0200
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@@ -38,7 +38,7 @@ CCL_NAMESPACE_END
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 #define CUDA_VERSION 3020
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-#if defined(__x86_64) || defined(AMD64) || defined(_M_AMD64)
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+#if defined(__x86_64) || defined(AMD64) || defined(_M_AMD64) || defined(__LP64__)
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 typedef unsigned long long CUdeviceptr;
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 #else
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 typedef unsigned int CUdeviceptr;