It seems that the change here:
http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/commands/as
ync.c?rev=1.125;content-type=text%2Fx-cvsweb-markup has broken
slony1_funcs:

gcc -g -O2 -I../.. -I/usr/local/pgsql/include
-I/usr/local/pgsql/include/server
-DPGSHARE="\"/usr/local/pgsql/share/\""  slonik.o dbutil.o parser.o
win32ver.o -lpgport -L/usr/local/pgsql/lib -L/usr/local/pgsql/lib -lpq
-lintl  -lpq -o slonik.exe
make[2]: Leaving directory `/cvs/slony1-engine/src/slonik'
make[2]: Entering directory `/cvs/slony1-engine/src/backend'
gcc -g -O2 -I../..  -I/usr/local/pgsql/include
-I/usr/local/pgsql/include/server
-I/usr/local/pgsql/include/server/port/win32  -c -o slony1_funcs.o
slony1_funcs.c
slony1_funcs.c: In function `_Slony_I_cleanupListener':
slony1_funcs.c:1081: error: too many arguments to function
`Async_Unlisten'
make[2]: *** [slony1_funcs.o] Error 1
make[2]: Leaving directory `/cvs/slony1-engine/src/backend'
make[1]: *** [all] Error 2
make[1]: Leaving directory `/cvs/slony1-engine/src'
make: *** [all] Error 2

I don't have time to look at this at the moment, and I'm not sure what
the best way to fix it is anyway :-(

Regards, Dave.