error "`ft2build.h' hasn't been included yet!

Add include to "freetype.h"

/* add this line */
#include <ft2build.h>

#ifndef FT_FREETYPE_H
#error "`ft2build.h' hasn't been included yet!"
#error "Please always use macros to include FreeType header files."
#error "Example:"
#error "  #include <ft2build.h>"
#error "  #include FT_FREETYPE_H"
#endif