Install gnulib by entering the following commands in the terminal:
sudo apt update sudo apt install gnulib
Description:
GNU Portability Library
The GNU portability library is a macro system and C declarations and definitions for commonly-used API elements and abstracted system behaviors. It can be used to improve portability and other functionality in your programs.
Homepage: http://www.gnu.org/software/gnulib/
Version: 20140202+stable-2build1
Section: universe/devel