Current version is 2.2.0, just renamed ebuild and it's working fine.
Created attachment 26616 [details] Attachment New ebuild for libpqxx
I confirm that this ebuild works, although it does not install shared libraries (.so) which i fixed - see attachment. This version bump is badly needed, as 2.0 series are almost a half year old and do not even exist masked in the portage tree...
Created attachment 28492 [details] ebuild for libpqxx-2.2.1
I've just added it to portage tree. Thank you for contribution :)