@barryascott, the documentation and error are recursive:
Install needed dependencies (optional)
kdesrc-build provides some initial setup mode to install the needed packages for several common distributions to start developing.
This is helpful if you are not sure if all needed development packages are installed on your system and you don’t want to take care of this yourself manually.
As this will try to install packages for your distribution, this step will require administrator rights for the package installation.
To do that, just trigger:kdesrc-build --initial-setup
In order to install the required dependencies, it recommends that I invoke the command which, itself, lacks dependencies. I am tempted to report this to Bugzilla.
It’s not installed from an RPM. It’s installed from a BaSH script.