Installing abinit is completely standardized, following linux package conventions as
Running make install will put the binary executables in a bin/ subdirectory, the documentation and test files in doc/ and so on.
The installation will happen in a reference install directory, which by default is /usr/local/. If you wish to choose your own installation directory, re-run
configure --prefix=<your chosen install point>
This allows access to the code for many users on a cluster, or the installation of several versions of abinit if necessary.