Word of warning: The Makefiles in the AVR32 Software Framework version 1.7 feature broken GCC Makefiles (hardcoded paths, incomplete files, etc). For now, make sure you are using an older revision if you don’t need the new UC3C and UC3L files. We host a local mirror of the 1.5 version: AVR32-SoftwareFramework-AT32UC3-1.5.0.zip