I added the previous repos to get pgsql 8.3 on this ubuntu 10.04
machine, but now I'm close to installing pgsql from source to get the
latest version as well and see if compiling will then work.

wget http://www.slony.info/downloads/1.2/source/slony1-1.2.21.tar.bz2
tar xvjf slony1-1.2.21.tar.bz2
cd slony1-1.2.21/
./configure --with-pgpkglibdir=/usr/lib/postgresql/8.3/lib/
make

I get this at the end:

xxid.c: In function '_Slony_I_xxid_ge_snapshot':
xxid.c:409: warning: cast to pointer from integer of different size
make[2]: *** [xxid.o] Error 1
make[2]: Leaving directory `/home/dgish/slony1-1.2.21/src/xxid'
make[1]: *** [all] Error 2
make[1]: Leaving directory `/home/dgish/slony1-1.2.21/src'
make: *** [all] Error 2

and it doesn't seem to install after that.  In the past I've seen
complaints about xxid, but it still finished compiling.

I think I'll just try source compiling both pgsql and slony1

-- 
To understand recursion, one must first understand recursion.