I have never doubted my abilities more, before this happened:

I got a Linux VM on Azure, downloaded apache httpd source which I proceeded to configure, make and install.

As expected, install failed with something related to apr and apr-util.

Searched several mailing lists, tried out several configure options, nothing worked..

After almost an hour, it stuck to me, all I had to do was "sudo yum install httpd" !!!

Disappointed that I missed something so simple, but when I did that, it came back with 'Nothing to do'...

Realized, httpd was pre-installed in that VM.. I just had to start the service !!!

:facepalm