On 4 January 2015 at 19:41, Tim Prince wrote: > Yes, sorting out -E shows that some of these .h files are updating only > in a newer directory which comes later on the search path than the > directory which was used a month ago. So the advice about clean > environment includes cleaning out the old installation directories. That doesn't sound right to me. None of the relevant libstdc++ files should have moved location, at least not since the include path changed from include/c++/4.9.0 to include/c++/5.0.0, and no other directory containing a c++config.h should be in the search path. Which files were you seeing duplicated in "the directory used a month ago" and what directory was that?
