Apache 2.x must be installed in order to install the TPS subsystem. Check that the appropriate version of Apache is installed.
yum info httpd Installed Packages Name : httpd Arch : x86_64 Version: 2.2.3 Release: 22.el5_3.2 Size : 2.9 M Repo : installed ...
Install Apache if it is not already available. For example:
yum install httpd