Ardour build error

I’m trying to do a new build of ardour, and am getting an error message. Am I missing a dependency or something?

libs/pbd/ undefined reference to std::_List_node_base::_M_unhook()' libs/sigc++2/ undefined reference tostd::_List_node_base::_M_unhook()@GLIBCXX_3.4.14
libs/sigc++2/ undefined reference to std::_List_node_base::_M_hook(std::_List_node_base*)@GLIBCXX_3.4.14' libs/pbd/ undefined reference tostd::_List_node_base::_M_hook(std::_List_node_base*)’
collect2: ld returned 1 exit status
scons: *** [gtk2_ardour/ardour-2.8.11] Error 1
scons: building terminated because of errors.

Disregard, it’s fixed.