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diff -up ClanLib-1.0.0/Sources/API/Core/System/cl_assert.h~ ClanLib-1.0.0/Sources/API/Core/System/cl_assert.h
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--- ClanLib-1.0.0/Sources/API/Core/System/cl_assert.h~	2006-10-27 03:55:01.000000000 +0200
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+++ ClanLib-1.0.0/Sources/API/Core/System/cl_assert.h	2018-05-29 14:54:12.132106898 +0200
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@@ -33,6 +33,8 @@
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 #ifndef header_cl_assert
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 #define header_cl_assert
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+#include <cstddef>
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+
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 #ifdef CL_API_DLL
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 #ifdef CL_CORE_EXPORT
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 #define CL_API_CORE __declspec(dllexport)