Christian Ehrlicher wrote: > SVN commit 505391 by chehrlic: > /* regular header from msvc includes */ > +#define _USE_MATH_DEFINES > #include <../include/math.h> I've done the same at this moment! It could also be guarded: #if defined(_MSC_VER) && (_MSC_VER >=1400) #define _USE_MATH_DEFINES #endif