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--- common/common.h.orig 2010-02-03 17:25:48.378388768 +0100 +++ common/common.h 2010-02-03 17:26:24.401327942 +0100 @@ -634,3 +634,5 @@ #endif +#define M_LOG2_E 0.693147180559945309417 +#define log2f(x) (logf (x) / (float) M_LOG2_E)