add/remove applications

[sandruviou]

ok everybody im a bit of a newbe but im having a big problem. When i try and add development tools im getting errors 

packages not found
libxml2 (libxslt', '1.1.12','2')
libxml2 (libxml2-python', '2.6.16','2')
cyrus-sasl ('cyrus-sasl-md5', '2.1.18', '2.2')
cyrus-sasl ('cyrus-sasl-plain', '2.1.18', '2.2')
libuser ('system-config-users', '1.2.28', '0.fc2.1')


there was no errors on the orignal install of the operating system. 
What can i do :-? 


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