CMake version 2.6 which is outdated.

[ashish-kus]

The project currently requires CMake version 2.6 which is outdated. Modern CMake versions (3.5+) have removed compatibility with versions < 3.5, resulting in the following error when building.

ERROR

mkdir -p build
cd build && \
cmake .. && \
make
CMake Error at CMakeLists.txt:1 (cmake_minimum_required):
  Compatibility with CMake < 3.5 has been removed from CMake.

  Update the VERSION argument <min> value.  Or, use the <min>...<max> syntax
  to tell CMake that the project requires at least <min> but has been updated
  to work with policies introduced by <max> or earlier.

  Or, add -DCMAKE_POLICY_VERSION_MINIMUM=3.5 to try configuring anyway.


-- Configuring incomplete, errors occurred!
make: *** [Makefile:11: build] Error 1

[ashish-kus]

Found some more errors while compiling. These are causing errors because they access the internal structure of WINDOW. The ncurses library intentionally hides its internal structures and requires using accessor functions. The printf-style functions require a valid format string

/home/ashishk/Downloads/temp/Linux-System-Monitor/src/ncurses_display.cpp:81:54: error: invalid use of incomplete type ‘WINDOW’ {aka ‘struct _win_st’}
   81 |               processes[i].Command().substr(0, window->_maxx - 46).c_str());
      |                                                      ^~
In file included from /home/ashishk/Downloads/temp/Linux-System-Monitor/src/ncurses_display.cpp:1:
/usr/include/curses.h:456:16: note: forward declaration of ‘WINDOW’ {aka ‘struct _win_st’}
  456 | typedef struct _win_st WINDOW;
      |                ^~~~~~~
/home/ashishk/Downloads/temp/Linux-System-Monitor/src/ncurses_display.cpp: In function ‘void NCursesDisplay::Display(System&, int)’:
/home/ashishk/Downloads/temp/Linux-System-Monitor/src/ncurses_display.cpp:94:45: error: invalid use of incomplete type ‘WINDOW’ {aka ‘struct _win_st’}
   94 |       newwin(3 + n, x_max - 1, system_window->_maxy + 1, 0);
      |                                             ^~
/usr/include/curses.h:456:16: note: forward declaration of ‘WINDOW’ {aka ‘struct _win_st’}
  456 | typedef struct _win_st WINDOW;
      |                ^~~~~~~

I can submit a pull request that fixes these minor issues. Would you be open to a PR addressing these issues? I've already tested the solutions locally and confirmed they resolve the compilation errors.