Use latest glbinding release instead of git head

README.md

 * [SDL2](http://www.libsdl.org) or [GLFW](http://www.glfw.org)
 * [OpenAL](http://www.openal.org) & [ALUT](https://github.com/vancegroup/freealut) (optional, needed for sound output)
 
-Mac OS X with XCode and [MacPorts](http://www.macports.org) installed (or replace `libsdl2` by `glfw`):
-
-    sudo port install cmake glm libsdl2
-
-Unfortunately, glbinding is not available as binary. But it can be built and installed from source easily. To create a distributable Bundle with glbinding in the default location, do this before running `make install`:
-
-    sudo install_name_tool -id /usr/local/lib/libglbinding.dylib /usr/local/lib/libglbinding.dylib
-
 ## Building
 
 The basic steps needed to build and run OpenRaider:

cmake/travis_script_linux.sh

 if [ "$CC" = "clang" ]; then export CC="clang-3.5"; fi
 if [ "$CXX" = "clang++" ]; then export CXX="clang++-3.5"; fi
 
-# Need to build current glbinding from source
-git clone https://github.com/hpicgs/glbinding.git
-cd glbinding
+# Need to build latest glbinding from source
+GLBVER=`curl https://api.github.com/repos/hpicgs/glbinding/releases/latest | grep -m1 tag_name | cut -d\" -f4`
+curl -L https://github.com/hpicgs/glbinding/archive/${GLBVER}.tar.gz | tar xzf -
+cd glbinding-${GLBVER#v}
+
+# Hacky fix to allow building glbinding with clang on Linux
 sed -i 's/  -Werror/  /g' cmake/PlatformLinuxGCC.cmake
+
 mkdir build
 cd build
 cmake ..
 cd ..
 cd ..
 
+# Build OpenRaider and run the unit tests
 mkdir build && cd build && cmake .. && make -j 4 && make check