You first need to install R. Here are the main links depending on your OS:
To install seewave, launch R, and then in the console:
seewave needs other packages to run properly, if not installed, you should do this:
With Linux, you need to install the fftw3 andd fftw3-dev libraries. In the terminal do this:
sudo apt-get install libfftw3-3 libfftw3-dev
With Linux, you need to install the libsndfile1 libsndfile1-dev libraries. In the terminal do this:
sudo apt-get install libsndfile1 libsndfile1-dev
With Linux, there is sometimes a trouble installing the package rgl. In the terminal do this:
sudo apt-get install r-cran-rgl
and then try to re-install seewave from the R console.
With Mac OS, there is sometimes a trouble installing the package tcltk. The console just freeezes when loading seewave. Following the instructions detailed in the R page, you need to download this additional tool.