I wanted to install Mod Security 2 on my Ubuntu Jeos 8.04 server, but there isn't a package anymore.Some googling later I came across this article: How to install Mod Security 2.
I didn't modify the Makefile; just run
./configurein the apache2 directory and it works.
If this is the first thing you compile on Ubuntu server you also have to install the build tools with the following command:
sudo apt-get install build-essential
