The package can be installed with the Julia package manager. From the Julia REPL, type
] to enter the Pkg REPL mode and run:
pkg> add Nevanlinna
Manual installation from source
You should almost never have to do this, but it is possible to install Nevanlinna.jl from source as follows:
git clone https://github.com/nogaki/Nevanlinna.jl.git julia -e "import Pkg; Pkg.add(path=\"Nevanlinna.jl\")"
This is not recommended, as you will get the unstable development version and no updates.