Comment 2 for bug 903752

libverto or libevent don't provide integration for talloc, which is one of the key features of libtevent.

At the very least you would need a wrapper layer in libldb and sssd around libevent or libverto.

Samba 4/OpenChange/Evolution-mapi (in universe) also rely on tevent and the fact that libldb uses it. They would have to be patched to use the same event library libldb uses or compiled against a fork of libldb without the patch.