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/Irrlicht/source.txt

@@ -0,0 +1,40 @@
+Source code of the Irrlicht Engine
+
+The complete source of the Irrlicht Engine can be found when decompressing
+the .zip file included 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 1.helloworld)
+
+The source of the engine is only included because of 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 in linux yourself, unzip the source source.zip
+file in the \source directory. Run a 'make' in the now existing new subfolder 'Irrlicht'.
+After this, you should be able to make all example applications in \examples.
+Then just start an X Server and run them, from the directory where they are.
+
+If you get a compiling/linking problem like 
+
+ undefined reference to `glXGetProcAddress'
+ 
+Then there are several solutions: 
+A) This disables the use of OpenGL extensions:
+  Open the file IrrCompileConfig.h, comment out _IRR_OPENGL_USE_EXTPOINTER_,
+  and recompile Irrlicht using 
+  make clean
+  make
+B) Replace all occurrences of 'glXGetProcAddress' with 'glXGetProcAddressARB' and run a
+   make
+   This will solve the issue but keep the OpenGL extension enabled.
+