(Re)compiling screen from source

Older versions of the UNIX screen program can't split windows vertically.

Do the following to compile screen from source:

$ git clone git://git.savannah.gnu.org/screen.git screen
$ cd screen/src
$ ./autogen.sh
$ ./configure
$ ./config.status
$ make
$ sudo make install
$ screen --version

The screen/src/INSTALL file is chatty. But it explains the steps listed here.