HELP about ragnar HOT 13 CLOSED

Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
gcc is already the newest version (4:11.2.0-1ubuntu1).
make is already the newest version (4.3-4.1build1).
xorg is already the newest version (1:7.7+23ubuntu2).
xorg-dev is already the newest version (1:7.7+23ubuntu2).
git is already the newest version (1:2.34.1-1ubuntu1.9).
0 upgraded, 0 newly installed, 0 to remove and 5 not upgraded.
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
libfreetype6-dev is already the newest version (2.11.1+dfsg-1ubuntu0.2).
0 upgraded, 0 newly installed, 0 to remove and 5 not upgraded.
Cloning into 'Ragnar'...
remote: Enumerating objects: 242, done.
remote: Counting objects: 100% (11/11), done.
remote: Compressing objects: 100% (11/11), done.
remote: Total 242 (delta 3), reused 1 (delta 0), pack-reused 231
Receiving objects: 100% (242/242), 1.32 MiB | 4.89 MiB/s, done.
Resolving deltas: 100% (136/136), done.
rm -f ragnar
rm -f /usr/bin/ragnar
gcc ragnar.c -o ragnar -I/usr/include/freetype2 -lX11 -lXcursor -lXft -O3 -ffast-math -Wall -Wextra
ragnar.c: In function ‘handle_button_press’:
ragnar.c:464:13: warning: ignoring return value of ‘system’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
  464 |             system(BarButtons[i].cmd);
      |             ^~~~~~~~~~~~~~~~~~~~~~~~~
ragnar.c: In function ‘handle_key_press’:
ragnar.c:492:9: warning: ignoring return value of ‘system’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
  492 |         system(TERMINAL_CMD);
      |         ^~~~~~~~~~~~~~~~~~~~
ragnar.c:494:9: warning: ignoring return value of ‘system’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
  494 |         system(WEB_BROWSER_CMD);
      |         ^~~~~~~~~~~~~~~~~~~~~~~
ragnar.c:589:9: warning: ignoring return value of ‘system’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
  589 |         system(APPLICATION_LAUNCHER_CMD);
      |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
cp ragnar /usr/bin/ragnar