Need a way to specify the path for the 32/64 bit libraries

[niXman]

In gcc/config/i386/t-mingw-w32 path are correct: MULTILIB_OSDIRNAMES =
../lib64 ../lib
Why, only the lib is used?

Details: http://gcc.gnu.org/ml/gcc-help/2012-03/msg00115.html

-- 
Regards,
  niXman