Installing on Sun machine

Hi, I am trying to get 7.3.1 running on my Sun server. It all seemed to
install ok, but when running initdb I get this appearing

bash-2.03$ /usr/local/pgsql7.3.1/bin/initdb -D /usr/local/pgsql7.3.1/data/
The program
'/usr/local/pgsql7.3.1/bin/postgres'
needed by initdb does not belong to PostgreSQL version 7.3.1, or
there may be a configuration problem.

This was the error message issued by that program:
ld.so.1: /usr/local/pgsql7.3.1/bin/postgres: fatal: libreadline.so.4: open
failed: No such file or directory

System details:

bash-2.03$ uname -a
SunOS webdev1 5.8 Generic_108528-12 sun4u sparc SUNW,UltraAX-i2

Anybody know what I did wrong?

Thanks for any help

Adam

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