o Minor bugfixes (portability): - Use libexecinfo on FreeBSD, to enable backtrace support. Fixes part of bug 17151; bugfix on 0.2.5.2-alpha. Patch from Marcin Cieślak. o Minor bugfixes (testing): - Skip backtrace tests when backtrace support is not compiled in. Fixes part of bug 17151; bugfix on 0.2.7.1-alpha. Patch from Marcin Cieślak.