Running the setup script, I receive the following:

ERROR:  could not access file "$libdir/xxid": No such file or directory

Can someone tell me where $libdir is defined, and/or what it is supposed 
to be?  xxid files are found all over both my Master and Slave machines:

slony at oso: [/usr/src/slony1-1.0.2] find / -name "*xxid*"
/usr/local/lib/postgresql/xxid.so
/usr/local/share/postgresql/xxid.v73.sql
/usr/local/share/postgresql/xxid.v74.sql
/usr/local/pgsql/share/xxid.v73.sql
/usr/local/pgsql/share/xxid.v74.sql
/usr/local/pgsql/lib/xxid.so
/usr/src/slony1-1.0.2/src/xxid
/usr/src/slony1-1.0.2/src/xxid/xxid.c
/usr/src/slony1-1.0.2/src/xxid/xxid.v73.sql
/usr/src/slony1-1.0.2/src/xxid/xxid.o
/usr/src/slony1-1.0.2/src/xxid/xxid.so
/usr/src/slony1-1.0.2/src/xxid/xxid.v74.sql
/usr/ports/databases/slony1/work/slony1-1.0.2/src/xxid
/usr/ports/databases/slony1/work/slony1-1.0.2/src/xxid/xxid.c
/usr/ports/databases/slony1/work/slony1-1.0.2/src/xxid/xxid.v73.sql
/usr/ports/databases/slony1/work/slony1-1.0.2/src/xxid/xxid.o
/usr/ports/databases/slony1/work/slony1-1.0.2/src/xxid/xxid.so
/usr/ports/databases/slony1/work/slony1-1.0.2/src/xxid/xxid.v74.sql