As of a few hours ago, avr target build broken by recent 'DC' type update to libgcc2.
In file included from /Applications/avr/avr-src/gcc/libgcc2.c:56: /Applications/avr/avr-src/gcc/libgcc2.h:96: error: unable to emulate 'DC' make[2]: *** [libgcc/./_muldi3.o] Error 1 -- Summary: avr target build broken by recent 'DC' type update to libgcc2 Product: gcc Version: 4.0.0 Status: UNCONFIRMED Severity: normal Priority: P2 Component: c AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: schlie at comcast dot net CC: gcc-bugs at gcc dot gnu dot org GCC build triplet: powerpc-apple-darwin7.8.0 GCC host triplet: powerpc-apple-darwin7.8.0 GCC target triplet: avr-unknown-none http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19920