what are the dependecies file requried to install gcc in redhat 6.1, these dependecies file already present in system. if present the how activate and no then what are those ?????
what is the best gcc software to install on redhat 6.1 ?????

yum install gcc.

And yum upgrade so that you get from RHEL6.1 to RHEL6.7. If you have a support contract. If not, use Centos instead.

EDIT: Perhaps you have trouble installing gcc because you have no support contract. If so, you can convert your system to Centos without much trouble; find a cookbook on the internet (I don't know it by heart but did it once with ease and with success).

when i am using the command:

yum install gcc.

then it showing "package not found"

What if you do yum search gcc?
And which repository are you using?

output of command: yum search gcc


Loaded plugins: product_id, subscription-manager
updating red hat repositories.

libgcc.i86 : gcc version 4.4 shared support library
libgomp.i86 : gcc openMP v3.0 shared support library

Name and summary match only, use "search all" for everything
====================================================================


Repositories:
[root@localhoat etc]# cat yum.conf
[main]
cachedir=/var/cache/yum/$basearch/$releserver
keepcache=1
debuglevel=2
logfile=/var/log/yum.lob
exactarch=1
obsolectes=1
gpgcheck=1
plugins=1
installonly_limit=3


[root@localhoat yum.repos.d]# cat redhat.repo
#
# red hat repositories
#Managed by (rhsm) subscription-manager

[root@localhoat yum.repos.d]# cat rhel-source.repo
[rhel-source]
name= Red Hat Enterprise Linux $releasever - $basearch - Source
baseurl=ftp://ftp.redhat.com/pub/redhat/linux/enterprise/$releaserver/en/os/SRPMS/
enabled=0
gpgcheck=1;
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-redhat-release

[rhel-source-beta]
name= Red Hat Enterprise Linux $releasever Beta - $bas earch - Source
baseurl=ftp://ftp.redhat.com/pub/redhat/linux/beta/enterprise/$releaserver/en/os/SRPMS/
enabled=0
gpgcheck=1;
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-redhat-beta,file:///etc/pki/rpm -gpg/RPM-GPG-KEY-redhat-release

Now chage is requried to install gcc ??????

Changing GCC without a VERY GOOD REASON, against what is in the repositories, is risky.

Since you're under support with Red Hat, the simplest thing you can do is to call Red Hat support, and they can assist you.

If redhat.repo were really managed by subscription manager, you wouldn't be on RHEL 6.1 anymore. So I doubt that you have a contract, and it looks like you have no binary repositories configured.

Thus yum doesn't find gcc.

Again my suggestion: Switch to Centos, update to 6.7.
If I am wrong and you do have a contract, upgrade to RHEL6.7 as soon as you can. Then you will alao have an up to date version of gcc.

which red hat version need to install, no any problem occur???

6.7 or 7.1. In other words, the latest.

can i download some gcc version and installed ????

Yes.

However you won't know whether it is compatible with your operating system. See also TB0ne's remark on this page.

And you will probably have to install a bunch of dependencies. yum would do that for you automatically.

Frankly, you will have much less hassle if you update to RHEL 6.7 or 7.1. If you can't do that for lack of contract, you will still have much less hassle converting your RHEL system to Centos and updating to Centos 6.7 or 7.1.

what is the sense of "contract" in linux ??????

RHEL really is not a free operating system
to install software and SECURITY UPDATES you need to buy the REQUIRED support contract
https://www.redhat.com/wapps/store/allProducts.html

normally ( if a server is not set to require a MANUAL upgrade ) running a update would have upgraded 6.1 to 6.2 then to 6.3 and to the current 6.7

and normally software is installed using yum and the redhat software repos ( that you get access to with the paid for license )

now for installing gcc you normally install the software group "Development Tools"
or
do to a bit of odd luck there happens to be a second way
and that will also install the needed dependencies

BUT

you need a registered and paid for install first

redhat also has there own development tools

"Developer Toolset"

https://access.redhat.com/documentat...t-Install.html

so i will change the RHEL 6.1 to REHL 7.1 beta version.

So Any Kind of problem will occur releted to dependencies and software ????

The gcc-c++ will work ???

this is the beta version of any problem in future ?????

Why beta? RHEL 7.1 is released and fully supported.
Once you run a supported version of RHEL and have correct repositories set up, you can yum install gcc. You then have a working compiler.

I don't know what you mean by the last remark. Apart from bugs, you won't have problems if you use supported operating system versions.