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--- src/fileformat/ppmio.cpp.orig 2009-05-25 19:24:49.000000000 +0000 +++ src/fileformat/ppmio.cpp 2014-02-20 19:04:01.556587853 +0000 @@ -34,6 +34,8 @@ #include <math.h> #include <assert.h> +#define log2(x) ((float)log(x)/log(2)) + struct PPMData { pixval maxPV;