Rather than using the truly ancient toolchains in WinAVR & Crosspack, you may be interested in using MHV AVR Tools instead, which is a multiplatform up to date AVR toolchain (GCC 4.7.2 & AVR LibC 1.8.0).
http://www.makehackvoid.com/mhvavrtools-20121007
For the latest version, Win32, Linux x86 & x64 are available now, MacOSX is still cooking.