how to install qt 4.7 in Centos 6
 

I am not able to install qt 4.7 in Centos 6, qt 4.6.2 is already installed. Any one with suggestions

Remove 4.6.2 and build 4.7 from source. You can download it here:

http://qt-project.org/downloads

mind you if you do build qt4.7 from source
you will not be able to use any centos 6.4 rpm's that use QT
you might want to add an "exclude" QT command to yum.conf
to prevent any qt programs that need 4.6 from installing

you will have to also build those programs from source if you want to use them

there is "kde-redhat.sf.net"
from the cent wiki page for additional repos
http://wiki.centos.org/AdditionalResources/Repositories
it points here
-- but i have NEVER used it so ....
http://kde-redhat.sourceforge.net/

Thank you very much for the suggestions. But Im still confused, whats the best option

The most easy is : # yum install qt47 ( Or / and # yum install qt47-devel ).

' qt47* ' is in the atrpms.repo
http://atrpms.net/ >> http://atrpms.net/documentation/install/

Be aware that the "atrpms.repo" can / will conflict with other repos.
A temporary use for specific packages is recommended : See Yum Priorities
http://wiki.centos.org/PackageManagement/Yum/Priorities