mention or x11-server-devel

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@31987 15284696-431f-4ddb-bdfa-cd5b030d7da7

REQUIREMENTS.html

@@ -51,7 +51,7 @@ to install some of them.)
 <br>
 
 <li><B>X Window</B>  system for graphical output, development libraries (X development
-libraries, in some linux distributions they are separate packages, e.g. xlibs-dev)
+libraries, in some linux distributions they are separate packages, e.g. xlibs-dev or or x11-server-devel)
 <br><a href="http://www.xfree.org">http://www.xfree.org</a>
 <br><a href="http://www.x.org">http://www.x.org</a>
 <br>winGRASS note: As alternative a generic MS-Windows driver is under