haawda [1] filed a request to merge gcc63 [2] into gcc6 [3]: valandil makes a better job than me, and pdftk uses gcc6 now for building. [1] https://aur.archlinux.org/account/haawda/ [2] https://aur.archlinux.org/pkgbase/gcc63/ [3] https://aur.archlinux.org/pkgbase/gcc6/