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To be a bit more compatible with layman...maybe. If anyone ever bothers.
Fix Compilation

Get the 9.0 patches instead of the 9.1 patches. Since the makefiles
automatically detect whether or not to use/enable XML support, we don't
need to explicitly state it ourselves. And, because the build order is
the same whether or not we are building the server, skip that test.

And, get rid of those damn extra pluses sed decided to put in.
Improve Live Ebuild and Simplify Compilation

There were several holdovers from the old ebuilds that were entirely
unnecessary for quite some time. They've been removed.

The base.patch modifies the Makefiles so that we don't have to worry
about whether we're building the server or not. The server-related
targets won't be made when the 'server' USE flag is disabled.

Dropped 'dohtml ...' in favor of 'docinto html; dodoc ...' per
gentoo-dev list conversation. [1]

Include a sample psqlrc file instead of just keeping the
/etc/postgresql-${SLOT} directory to make it a bit easier to figure out
what to do with it when you don't have the server installed.

Corrected the src_install() on postgresql-9.2.5.ebuild as it wasn't
properly unified.

Include the previously ignored 'man 3 ...' pages.

[1] http://www.gossamer-threads.com/lists/gentoo/dev/291541