This directory was generated from the mesa-7.2.tar.gz archive by unpacking it
and executing

$ mkdir $VBOX_PATH/src/VBox/Additions/x11/x11include/mesa-7.2
$ for i in `find include src/mesa -name '*.h' | grep -v src/mesa/drivers` \
           `find src/mesa/drivers/dri/common -name '*.h'`
    do
      cp --parents $i $VBOX_PATH/src/VBox/Additions/x11/x11include/mesa-7.2
    done

in the mesa-7.2 directory.