For (more) complete instructions please refer to https://github.com/evaleev/libint/wiki

The installation procedure for the impatient and/or experts:
0) create configure in the source directory:
   $ ./autogen.sh
1) create a directory for object files (you cannot build in the source directory):
   $ mkdir ../build; cd ../build
2) configure the package:
   $ ../src_dir/configure
   Most often you will need to specify command-line options to configure.
   To obtain a list of configure options run 'configure --help'.

then either choose path a or b:

3a) build the Libint compiler, then generate and compile a library:
   $ make
4a) optional validation of the library:
   $ make check
5a) install the compiled library:
   $ make install

3b) build the Libint compiler, then generate and package a library for redistribution
   $ make export
   this produces a tarball with a Libint library that can be unpacked, configured, and compiled elsewhere.

