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Description of problem:
The specfile misses BuildRequires for ruby (and possibly ruby-devel,
I'm not sure here). Trying to rebuild the SRPM without ruby fails in
the last stage of rpmbuild with 
RPM build errors:
    File not found: /var/tmp/kdebindings-root/usr/lib/site_ruby
Installing ruby-devel alone doesn't fix it, with ruby-devel and ruby
it works (ruby isn't required by ruby-devel), perhaps ruby alone would
have been sufficient, too.

Version-Release number of selected component (if applicable):
kdebindings-3.3.0-2

How reproducible:
Always

Steps to Reproduce:
1. rpm -e ruby
2. rpmbuild --rebuild kdebindings-3.3.0-2.src.rpm
    

Actual Results:  rpmbuild fails with
RPM build errors:
    File not found: /var/tmp/kdebindings-root/usr/lib/site_ruby


Additional info: