GCC 5.1.1
Fedora 23 is built on GCC 5.1.1. For information on building your own code with this compiler release, refer to the upstream change info at https://gcc.gnu.org/gcc-5/changes.html
glibc 2.22
Fedora 23 provides version 2.22 of the GNU C libraries. Learn about the changes available in the latest version of glibc from the project's release announcement at https://www.sourceware.org/ml/libc-alpha/2015-08/msg00609.html
boost 1.59.0
Fedora 23 has boost 1.59.0 as the provided version of boost. More Information on the change can be found https://fedoraproject.org/wiki/Changes/F23Boost159 and http://www.boost.org/doc/libs/1_59_0/