Failed build dependencies – php

I am trying to upgrade PHP and got error from rebuilding SRC file.

[root@test download]# rpm –rebuild php-4.0.6-12.src.rpm
Installing php-4.0.6-12.src.rpm
error: failed build dependencies:
db2-devel is needed by php-4.0.6-12 imap-devel >= 2000-9 is needed by php-4.0.6-12
postgresql-devel is needed by php-4.0.6-12
unixODBC-devel is needed by php-4.0.6-12
libxml2-devel is needed by php-4.0.6-12
pspell-devel is needed by php-4.0.6-12
imap-devel is needed by php-4.0.6-12
[root@test download]#

Should I just ignore dependencies and install? It wouldn’t be any problem to use PHP afterwards?

Lintadsl,