On 5 January 2015 at 00:11, Tim Prince wrote: >>> Which files were you seeing duplicated in "the directory used a month >>> ago" and what directory was that? > c++config.h and a few others used to be updated in > $(PREFIX)/include/bits/ as well as where they are put now in That should never have happened. In the source tree the file is include/bits/c++config (with no .h) but it is installed to ${host_builddir}/c++config.h which should always have included the host triplet. It's been like that "forever" (many years at least).