Why is it difficult to install httpd?

Why is it difficult for httpd to install -- Linux Enterprise Application-Linux server application? The following is a detailed description. [I = s] This post was last edited by sunray at, September 26 ,.

I am using RedHat Linux AS4 and are ready to install httpd
My apr has been installed.
/Apr-0.9.4-24.5.i386.rpm
/Apr-util-0.9.4-21.i386.rpm

Next, install httpd.
[Root @ localhost RPMS] # rpm-ivh httpd-2.0.52-25.ent.i386.rpm
Warning: httpd-2.0.52-25.ent.i386.rpm: V3 DSA signature: NOKEY, key ID db42a60e
Error: Failed dependencies:
Httpd-suexec is needed by httpd-2.0.52-25.ent.i386
Suggested resolutions:
Httpd-suexec-2.0.52-25.ent.i386.rpm
I thought it should be a problem with associated installation, so I turned to install httpd-suexec-2.0.52-25.ent.i386.rpm first
However, the following prompt appears:
[Root @ localhost RPMS] # rpm-ivh httpd-suexec-2.0.52-25.ent.i386.rpm
Warning: httpd-suexec-2.0.52-25.ent.i386.rpm: V3 DSA signature: NOKEY, key ID db42a60e
Error: Failed dependencies:
Httpd = 2.0.52-25.ent is needed by httpd-suexec-2.0.52-25.ent.i386
Suggested resolutions:
Httpd-2.0.52-25.ent.i386.rpm

I am confused. Please help me to see what the problem is.