If you are trying to install Mod_SSL on CentOS you will sometimes get the following error. The error will look something like this:

Finished Dependency Resolution
httpd-devel-2.2.3-31.el5.centos.2.i386 from updates has depsolving
problems
–> Missing Dependency: httpd = 2.2.3-31.el5.centos.2 is needed by
package httpd-devel-2.2.3-31.el5.centos.2.i386 (updates)
Error: Missing Dependency: httpd = 2.2.3-31.el5.centos.2 is needed by
package httpd-devel-2.2.3-31.el5.centos.2.i386 (updates)

So if you run into this issue you can try one of 2 things, the easiest is too run:

yum clean all

Then try again.

Alternatively, you can install the package that is missing manually. In this example it would be:

yum install http-devel.x86_64

Once you run this try and re-install mod_ssl.

This is generally caused because yum will sometimes have problems finding the dependencies on 64bit versions of the OS

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