createdb -D xxxx not working

This is a transcript of what I am trying:

# setenv PGDATA2 /web/sites/1.192/db-data
# initlocation PGDATA2
initlocation: input argument points to /web/sites/1.192/db-data
We are initializing the database area with username root (uid=0).
This user will own all the files and must also own the server process.

Creating Postgres database system directory /web/sites/1.192/db-data

Creating Postgres database system directory /web/sites/1.192/db-data/base

# createdb -D PGDATA2
ERROR: Unable to locate path 'PGDATA2/root'
This may be due to a missing environment variable in the server
createdb: database creation failed on root.