Undefined symbols for architecture x86_64:
  "_mrb_as_rational", referenced from:
      _int_div in libmruby_core.a[19](numeric.o)
  "_mrb_complex_add", referenced from:
      _mrb_int_add in libmruby_core.a[19](numeric.o)
      _flo_add in libmruby_core.a[19](numeric.o)
  "_mrb_complex_copy", referenced from:
      _init_copy in libmruby_core.a[6](class.o)
  "_mrb_complex_div", referenced from:
      _int_div in libmruby_core.a[19](numeric.o)
      _flo_div in libmruby_core.a[19](numeric.o)
  "_mrb_complex_mul", referenced from:
      _mrb_int_mul in libmruby_core.a[19](numeric.o)
      _flo_mul in libmruby_core.a[19](numeric.o)
  "_mrb_complex_new", referenced from:
      _mrb_int_sub in libmruby_core.a[19](numeric.o)
      _int_div in libmruby_core.a[19](numeric.o)
      _flo_div in libmruby_core.a[19](numeric.o)
      _flo_sub in libmruby_core.a[19](numeric.o)
  "_mrb_complex_sub", referenced from:
      _mrb_int_sub in libmruby_core.a[19](numeric.o)
      _flo_sub in libmruby_core.a[19](numeric.o)
  "_mrb_complex_to_f", referenced from:
      _mrb_ensure_float_type in libmruby_core.a[21](object.o)
  "_mrb_complex_to_i", referenced from:
      _mrb_ensure_integer_type in libmruby_core.a[21](object.o)
  "_mrb_init_mrbgems", referenced from:
      _init_mrbgems in libmruby_core.a[29](state.o)
  "_mrb_init_mrblib", referenced from:
      _mrb_init_core in libmruby_core.a[16](init.o)
  "_mrb_rational_add", referenced from:
      _mrb_int_add in libmruby_core.a[19](numeric.o)
  "_mrb_rational_copy", referenced from:
      _init_copy in libmruby_core.a[6](class.o)
  "_mrb_rational_div", referenced from:
      _int_div in libmruby_core.a[19](numeric.o)
      _int_quo in libmruby_core.a[19](numeric.o)
  "_mrb_rational_mark", referenced from:
      _gc_mark_children in libmruby_core.a[14](gc.o)
  "_mrb_rational_mul", referenced from:
      _mrb_int_mul in libmruby_core.a[19](numeric.o)
  "_mrb_rational_new", referenced from:
      _mrb_int_sub in libmruby_core.a[19](numeric.o)
      _int_quo in libmruby_core.a[19](numeric.o)
      _int_quo in libmruby_core.a[19](numeric.o)
  "_mrb_rational_sub", referenced from:
      _mrb_int_sub in libmruby_core.a[19](numeric.o)
  "_mrb_rational_to_f", referenced from:
      _mrb_ensure_float_type in libmruby_core.a[21](object.o)
  "_mrb_rational_to_i", referenced from:
      _mrb_ensure_integer_type in libmruby_core.a[21](object.o)
ld: symbol(s) not found for architecture x86_64