gistfile1.txt

When you run pg_upgrade, you must provide the following information:
  the data directory for the old cluster  (-d OLDDATADIR)
  the data directory for the new cluster  (-D NEWDATADIR)
  the "bin" directory for the old version (-b OLDBINDIR)
  the "bin" directory for the new version (-B NEWBINDIR)

For example:
  pg_upgrade -d oldCluster/data -D newCluster/data -b oldCluster/bin -B newCluster/bin
or
  $ export OLDDATADIR=oldCluster/data
  $ export NEWDATADIR=newCluster/data
  $ export OLDBINDIR=oldCluster/bin
  $ export NEWBINDIR=newCluster/bin
  $ pg_upgrade