Check the attached build log.
Created attachment 162308 [details]
Color me confused, but what does that build log show? For example, what are your CFLAGS and CXXFLAGS?
Closing WONTFIX. libsigc++ 1.2 is completely deprecated and fixing this is a waste of time. If the latest version still shows that bug, I'll gladly fix it. But this old version has been in the tree for just too long.
Patches welcome though.