cd ~
sudo apt-get update
sudo apt-get install build-essential bin86 kernel-package libqt4-dev libncurses5-dev pkg-config
mkdir rtlinux
cd rtlinux
wget ftp://ftp.kernel.org/pub/linux/kernel/v4.x/linux-4.1.13.tar.xz 
wget https://www.kernel.org/pub/linux/kernel/projects/rt/4.1/patch-4.1.13-rt15.patch.gz
tar -xpf linux-4.1.13.tar.xz
gunzip patch-4.1.13-rt15.patch.gz
cp patch-4.1.13-rt15.patch linux-4.1.13
cd linux-4.1.13
cat patch-4.1.13-rt15.patch | patch -p1
make xconfig
make
sudo make modules_install
sudo make install