'Annoy' is a small C++ library for Approximate Nearest Neighbors 
 written for efficient memory usage as well an ability to load from / save to
 disk. This package provides an R interface by relying on the 'Rcpp' package,
 exposing the same interface as the original Python wrapper to 'Annoy'. See
 <https://github.com/spotify/annoy> for more on 'Annoy'. 'Annoy' is released
 under Version 2.0 of the Apache License. Also included is a small Windows
 port of 'mmap' which is released under the MIT license.

The 'APT Package Management System' provides Debian and
 Debian-derived Linux systems with a powerful system to resolve package
 dependencies. This package offers access directly from R.  This can
 only work on a system with a suitable 'libapt-pkg-dev' installation
 so functionality is curtailed if such a library is not found.

'Armadillo' is a templated C++ linear algebra library aiming towards
 a good balance between speed and ease of use. It provides high-level syntax and
 functionality deliberately similar to Matlab. It is useful for algorithm development
 directly in C++, or quick conversion of research code into production environments.
 It provides efficient classes for vectors, matrices and cubes where dense and sparse
 matrices are supported. Integer, floating point and complex numbers are supported.
 A sophisticated expression evaluator (based on template meta-programming) automatically
 combines several operations to increase speed and efficiency. Dynamic evaluation
 automatically chooses optimal code paths based on detected matrix structures.
 Matrix decompositions are provided through integration with LAPACK, or one of its
 high performance drop-in replacements (such as 'MKL' or 'OpenBLAS'). It can
 automatically use 'OpenMP' multi-threading (parallelisation) to speed up
 computationally expensive operations.

   The 'RcppArmadillo' package includes the header files from the 'Armadillo' library;
 users do not need to install 'Armadillo' itself in order to use 'RcppArmadillo'.
 Starting from release 15.0.0, the minimum compilation standard is C++14.

   Since release 7.800.0, 'Armadillo' is licensed under Apache License 2; previous
 releases were under licensed as MPL 2.0 from version 3.800.0 onwards and LGPL-3
 prior to that; 'RcppArmadillo' (the 'Rcpp' bindings/bridge to Armadillo) is licensed
 under the GNU GPL version 2 or later, as is the rest of 'Rcpp'.