TermChat is a simple terminal based chat program for users logged into the same machine, using the curses library and shared-memory IPC.
Ensure that your system has ncurses library installed.
In case it is not, run
sudo apt-get install libncurses5-dev for Ubuntu-like systems and,
sudo dnf install ncurses-devel for Fedora/Red Hat like systems.
Run the compiler with the lcurses or lncurses switch to link against the curses library.
On mac: gcc -lncurses main.c
Ensure that you add the switch after the name of the C program. This is because object files and libraries are linked in order in a single pass.