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Linux Find Out GNU gcc Compiler Version Used To Compile Running Kernel

I‘ve multiple version of gcc installed on my systems as follows:

ls -l /usr/bin/gcc*
lrwxrwxrwx 1 root root 7 Jan 11 05:20 /usr/bin/gcc -> gcc-4.4
-rwxr-xr-x 1 root root 239528 Sep 21 2010 /usr/bin/gcc-4.3
-rwxr-xr-x 1 root root 255536 Nov 15 2010 /usr/bin/gcc-4.4

I need to build a nvidia device driver using the same version of GNU compiler as was used to compile the currently running kernel. How do I find out the version of my GNU gcc compiler that was used by upstream Linux distribution to compile and pack my binary Linux kernel?
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No xauth Program; Cannot Forward With Spoofing Error and Solution

I want to use my local machine as the X server over ssh. But when I try to run ssh -X -v user@server1.example.com to the remote machine, I get the following error:

debug1: Remote: No xauth program; cannot forward with spoofing

How do I fix this problem and last updated September 22, 2010

When I type “yum update” under RHEL 5.x server I get the following error:

Error: Missing Dependency: xen-libs

How do I fix this problem?
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Linux: Configure Xorg X11 Window System

My xorg.conf file is missing as I deleted accidentally for some reason. Now, Xorg try to probe my hardware on every startup. How do I configure Xorg under Debian or any Linux distro / operating systems?
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CentOS / Redhat: Turn On SELinux Protection

SELinux enforces the idea that programs should be limited in what files they can access and what actions they can take. However, by default it is turned off under RHEL / CentOS 5.x server? How do I turn it on? How can I enable SELinux on CentOS / RHEL 6 IBM server?
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Can I Run Pidgin on Mac OS X?

Q. Can I install and run Pidgin instant messaging client under Mac OS X operating system?
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