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    <p>On CentOS, <a href="http://www.centos.org/modules/newbb/viewtopic.php?topic_id=33396&amp;forum=55" rel="nofollow noreferrer">most</a> of <a href="https://bugzilla.redhat.com/show_bug.cgi?id=591502" rel="nofollow noreferrer">the threads</a> I found insist on the importance of setting properly the environment variable <code>$DISPLAY</code>.</p> <blockquote> <p>Noticed that there DISPLAY environment variable was gone in that terminal session.<br> Opening new terminal session or use different terminal session solves the problem...</p> </blockquote> <pre><code>export DISPLAY=":1.0" </code></pre> <p>But on putty, is is harder, as explained in <a href="http://www.centos.org/modules/newbb/viewtopic.php?topic_id=38151&amp;forum=55" rel="nofollow noreferrer">this thread</a>:</p> <blockquote> <p>All the system-config commands are designed to be ran via X11 (a Linux GUI).<br> From the error messages its trying to run <code>gtk</code> commands which means its trying to open a GUI window, which is not going to happen via putty.<br> I would look for other commands to setup what your trying to do.</p> </blockquote> <p>Why wouldn't you use <a href="https://code.google.com/p/meld-installer/" rel="nofollow noreferrer">meld on Windows directly</a>?</p> <p>With putty only, you can try <a href="https://unix.stackexchange.com/a/76118">this solution</a>, based on X11 forwarding:</p> <p><img src="https://i.stack.imgur.com/Vpiko.jpg" alt="http://i.stack.imgur.com/Vpiko.jpg"></p> <p>That means:</p> <ul> <li>installing an X11 server on Windows, like <a href="http://sourceforge.net/projects/xming/" rel="nofollow noreferrer"><strong>XMing</strong></a>,</li> <li>don't forget the fonts: <code>yum install xorg-x11-font*</code>.</li> </ul>
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    1. COVery interesting, thank you, I read the same thread earlier but didn't understand all of this... I have installed Meld on Windows, but the git is installed on the server and using git mergetool on the server won't trigger a software running on the local machine, I guess... I could be wrong, but if so I didn't find how to. This said, I'm a little confuse, what help would bring to set the display variable by following the X11 forwarding solution ?
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    2. CO@JeremyBelolo it would declare the Windows display for the X11 of your Centos to use.
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    3. COHi, thanks again... But still doesn't work. DISPLAY=localhost:10.0 appears on printenv, but still getting RuntimeError: could not open display.
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