Changelog for libcxx-devel-3.8.0-3.fc23.i686.rpm :

* Thu May 19 2016 Tom Callaway - 3.8.0-3- use gcc on el7, fedora < 24. use clang on el6 and f24+ MAGIC.- bootstrap on
* Tue May 03 2016 Tom Callaway - 3.8.0-2- bootstrap off
* Tue May 03 2016 Tom Callaway - 3.8.0-1- initial package- bootstrap on