pg_upgrade unrecognized configuration parameter “unix_socket_directory”

I'm trying to upgrade Postgresql from 9.2 to 9.3 in Fedora 18 using this
command as the postgres user

$ pg_upgrade -b /bin -B /usr/pgsql-9.3/bin -d /var/lib/pgsql/data -D
/var/lib/pgsql/9.3/data/ -j 2 -u postgres

The error in the log:

command: "/bin/pg_ctl" -w -l "pg_upgrade_server.log" -D
"/var/lib/pgsql/data" -o "-p 50432 -b -c listen_addresses='' -c
unix_socket_permissions=0700 -c unix_socket_directory='/var/lib/pgsql'"
start >> "pg_upgrade_server.log" 2>&1
waiting for server to start....FATAL: unrecognized configuration parameter
"unix_socket_directory"
.... stopped waiting
pg_ctl: could not start server

That parameter was replaced by unix_socket_directories (plural) in 9.3. But
the server version being started is 9.2:

$ /bin/pg_ctl --version
pg_ctl (PostgreSQL) 9.2.4

What am I missing?

Regards, Clodoaldo