Just a quick post here. I recently recompiled screen with vertical split support on Ubuntu 8.04. Here’s how you do it:

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# Install dependencies to build screen
sudo apt-get build-dep screen

# Create an area to hold the source
cd ~/debian-src
mkdir screen
cd screen

# Get the source
apt-get source screen

# Apply vertical split patch
cd screen-4.0.3/
wget http://vsp4sdl.yuggoth.org/wrp_vertical_split_0.3_4.0.2.diff.bz2
bunzip2 wrp_vertical_split_0.3_4.0.2.diff.bz2
patch -p1 < wrp_vertical_split_0.3_4.0.2.diff

# Build it!
dpkg-buildpackage -us -uc -rfakeroot
cd ..

# Install it!
sudo dpkg -i screen_4.0.3-0.4ubuntu2_amd64.deb

That’s it.