Install inn2-dev by entering the following commands in the terminal:
sudo apt update sudo apt install inn2-dev
Description:
libinn.a library, headers and man pages
You will only need this if you are going to compile programs that require the functions in libinn.a.
Homepage: https://www.eyrie.org/~eagle/software/inn/
Version: 2.6.1-4build1
Section: universe/devel