[CentOS] build rpm from tar.xz tarball

Wed Feb 29 01:11:25 UTC 2012
fakessh @ <fakessh at fakessh.eu>

hello centos list
hello guys
hello master of "Fu"

how to create a rpm package for centos 5 with an archive tar.xz. 
I possess a source rpm of gnutls 
http://ns.fakessh.eu/rpms/gnutls-2.12.16-1.el5.src.rpm
 and I would try to compile the latest version of gnutls

What is the correct procedure to build an rpm with this type of package
tar.xz

sincerely
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