Hello,
My system is REHL5 linux and working properly but when i am trying to install a package of GCC (gcc-4.1.1-52.el5.src.rpm ) or any package the warning message is appear and the package is not installed, the procedure of installing is listed below, please help me to solve the problem.

The procedure:
1- Login as a root
2- rpm -ivh gcc-4.1.1-52.el5.src.rpm

warning: gcc-4.1.1-52.el5.src.rpm: Header V3 DSA signature: NOKEY, key ID 37017186
1:gcc warning: user brewbuilder does not exist - using root
warning: group brewbuilder does not exist - using root
warning: user brewbuilder does not exist - using root
warning: group brewbuilder does not exist - using root
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warning: user brewbuilder does not exist - using root
warning: group brewbuilder does not exist - using root
warning: user brewbuilder does not exist - using root
warning: group brewbuilder does not exist - using root
warning: user brewbuilder does not exist - using root
warning: group brewbuilder does not exist - using root
warning: user brewbuilder does not exist - using root
warning: group brewbuilder does not exist - using root
warning: user brewbuilder does not exist - using root

First, this is a source rpm, not a binary. Did you intend to build the binary locally? If not, then don't use this package. Get the binary package directly. Most RedHat users use yum to do this rather than downloading a package from somewhere and then using rpm. It's easier and safer.

If you do want to build locally, you will need to use rpmbuild --rebuild packagename. And you'd better create the brewbuilder user and group first: then you won't get those warnings. But in any case the reason the package wasn't installed is because it is a source package. That has nothing to do with the warnings.