http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54834
--- Comment #2 from Ian Lance Taylor <ian at airs dot com> 2012-10-08 16:19:25 UTC --- The error shows that libbacktrace is including ../gcc/include/unwind.h, but that file should not exist at the time that libbacktrace is built. I assume that it does exist, but why? Precisely how did you run configure?
