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--- src/glsl/ir_constant_expression.cpp.orig 2011-07-23 15:08:44.000000000 +0200
+++ src/glsl/ir_constant_expression.cpp 2011-07-23 15:09:03.000000000 +0200
@@ -39,6 +39,11 @@
#include "ir_visitor.h"
#include "glsl_types.h"
+#include <sys/param.h>
+#if __FreeBSD_version <= 704100 || (__FreeBSD_version >= 800000 && __FreeBSD_version < 802502) || (__FreeBSD_version >= 900000 && __FreeBSD_version < 900027)
+#define log2(x) (log(x) / log(2))
+#endif
+
static float
dot(ir_constant *op0, ir_constant *op1)
{
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