how to disable package installation prompt at command mode

[Benjamin]

  Hi All,

I am using fedora 15 32 bit on my laptop.I want to disable command line 
package installation option.

Suppose i type system-config-keyboard command on console but that 
command is not available in os then i m getting installation message on 
command line so i want to disable it.

system-config-keyboard
bash: system-config-keyboard: command not found...
Install package 'system-config-keyboard' to provide command 
'system-config-keyboard'? [N/y]


How to disable it?

Thanks,
Benjamin