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Description of problem:
Add OptionalRequires: in rpm spec structure so rpm --suggest option could be added

Example:
rpm -i kbarcode would install only kbarcode (provided that dependancies are satified)

rpm -i --suggest kbarcode would require optional packages to be istalled like mysql,PDF417 Encode and TBarcode. those packages are not required for kbarcode to have basic functionalities, but are used if installed.

Same for k3b: rpm -i --suggest k3b would require transcode to be installed. while this package is not mandatory for k3b to function properly, if istalled, it enhances k3b features.

in the spec file, a line like
OptionalRequires: transcode
would be added.

Version-Release number of selected component (if applicable):
any

How reproducible:
Always

Steps to Reproduce:
1. # rpm --suggest k3b
  

Actual Results:  Error messages recieved:
--suggest: unknown option


Expected Results:  # rpm -i --suggest k3b
error: Failed dependencies:
        transcode is required for k3b-0.11.20-1

or

# rpm -i --suggest k3b
error: Failed dependencies:
        transcode is suggested for k3b-0.11.20-1


Additional info: