SIM 5 and postgresql

[Dary]

Hi All

I am tring to install SIM on RH4, I can not remove postgresql before installing SIM; here are the output I am getting:

# rpm -e postgresql

error: Failed dependencies:
postgresql = 7.4.8-1.RHEL4.1 is needed by (installed) postgresql-server-7.4.8-1.RHEL4.1.i386
postgresql = 7.4.8-1.RHEL4.1 is needed by (installed) postgresql-pl-7.4.8-1.RHEL4.1.i386

# rpm -qa |grep postgresql|xargs rpm -e
error: Failed dependencies:
libpq.so.3 is needed by (installed) perl-DBD-Pg-1.31-6.i386
libpq.so.3 is needed by (installed) dovecot-0.99.11-2.EL4.1.i386

I am getting dep. err. msg. How to I get around this problem?

Thanks,
Dary.