GReortes version 3.5
Here in Github you can see only the C code !
cd /home/user_name/CMAKE/
gcc -c geortes521.c -lSDL_bgi -lSDL2
gcc -c input89.c -lSDL_bgi -lSDL2
gcc -o GReortes3.5 geortes521.o input89.o -lSDL_bgi -Wl,-rpath='${ORIGIN}/lib' -lSDL2 -lm -no-pie
(Prerequisite for libraries to be installed : SDL_bgi (v.2.4.1) and SDL2.0)
Necessary additional data files : https://sourceforge.net/projects/eortologio-gr/