Ticket 48537 - undefined reference to `abstraction_increment'
Bug Description: Nunc-stan's has a component, liblfds. This was failing with
gcc 6.0.
Fix Description: Fix a macro check for correctly detecting gcc 6 or higher in
liblfds. Increase the DS version of nunc-stans to 0.1.8 to consume the fix.
https://fedorahosted.org/389/ticket/48537
Author: wibrown
Review by: nhosoi (Thanks!)