Install libntl-dev by entering the following commands in the terminal:
sudo apt update sudo apt install libntl-dev
Description:
Number Theory Library, development files
NTL is a high-performance, portable C++ library providing data structures and algorithms for manipulating signed, arbitrary length integers, and for vectors, matrices, and polynomials over the integers and over finite fields. . This package contains development files for NTL.
Homepage: http://www.shoup.net/ntl/
Version: 10.5.0-2
Section: universe/libdevel