/usr/include/ImageMagick-6/magick
Edit: /usr/include/ImageMagick-6/magick/magick-baseconfig.h (203B)
#include
#if __WORDSIZE == 32
# include "magick-baseconfig-32.h"
#elif __WORDSIZE == 64
# include "magick-baseconfig-64.h"
#else
# error "unexpected value for __WORDSIZE macro"
#endif