When I tried to install net-fs/davfs2-0.2.1 there was no SSL support compiled in. I looked at the ebuild and saw there was 'use_enable ssl' in src_compile() rather than 'use_with ssl' Patch is attached.
Created attachment 38502 [details, diff] Patch to fix SSL support
This is also true for davfs2-0.2.2
fixed in davfs2-0.2.3. thanks