- added a small howto build/compile

diff --git a/BUILDING b/BUILDING
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+++ b/BUILDING
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+You need:
+- cmake 2.8.8+
+- Qt 5.1+
+- Irrlicht 1.8+ (is not used yet)
+- a decent compiler (at lease gcc 4.8.x or better clang 3.3+)
+
+howto:
+- if you like, set clang as default ("export CC=/usr/bin/clang; export CXX=/usr/bin/clang++")
+- run cmake in the local repo ("cmake .")
+- now you have a GNU makefile and you can compile the stuff with "make"