Avoid warning and make local variable lower-case.

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@6000 dfc29bdd-3216-0410-991c-e03cc46cb475

source/source.txt

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+Source code of the Irrlicht Engine
+
+The complete source of the Irrlicht Engine can be found in this directory. 
+Please note that YOU DO NOT NEED THIS SOURCE to develop 3d applications with
+the Irrlicht Engine. Instead, please use the .dll in the \bin directory, the 
+.lib in the \lib directory and the header files in the \include directory.
+
+You will find a good tutorial how to set up your development environment and to
+use the engine in the \examples directory. (Try 01.helloworld)
+
+The source of the engine is included because for the following reasons:
+
+	- To let developers be able to debug the engine.
+	- To let developers be able to make changes to the engine.
+	- To let developers be able to compile their own versions of the engine.
+	
+	
+	
+HOW TO COMPILE THE ENGINE WITH LINUX
+
+If you wish to compile the engine for Linux yourself, run a 'make' in the
+folder 'source/Irrlicht'. After this, you should be able to make all example
+applications in examples. Then just run them from the directory where they are
+built.
+For the necessary compiler and linker flags please check the provided Makefiles
+in the examples directories.
+
+Only the Software Drivers and the Null Driver will work on all Linux machines,
+while OpenGL support requires either GLX support of the X11 server (try glxinfo)
+or a software OpenGL solution such as Mesa.
+
+If you get a compiling/linking problem like 
+
+ undefined reference to `glXGetProcAddress'
+ 
+This is a problem introduced by the NVidia drivers. There are several solutions:
+A) Update your drivers. All versions with GLX 1.4 support (i.e. beginning with
+  12/2005) will work.
+B) Define the symbol _IRR_GETPROCADDRESS_WORKAROUND_ during compilation of
+   COpenGLDriver.cpp, either by adding it to the compiler command line or by
+   uncommenting the line defining this symbol inside the OpenGL driver source.
+   This will force the use of glXGetProcAddressARB which has better chances to
+   work on older systems.
+
+If you get compiling or runtime problems regarding XF86VidMode, Xxf86vm.so, or
+the XFree86 VidMode extension you have also several solutions:
+A) Install the extension for your X server or the developer package in case of
+   compiler/linker problems.
+B) Disable the VidMode usage by disabling the define _IRR_LINUX_X11_VIDMODE_ in
+   include/IrrCompileConfig.h
+   In this case you might give the RandR extension a try (by enabling the
+   next define in that file) which also provides fullscreen support under Linux.
+   If both extensions fail you won't have fullscreen support for Irrlicht.