SDL_ShowSimpleMessageBox is not displaying my error message

After installing a new OS(Manjaro Linux) which I was using before, when run the test in SDL2-2.0.14/test(testmessage.c) I get this help.
Nothing but garbage is printed on the message box, but not in the title. Any idea, what’s going on?

P.S. When I get the message along side an SDL_Log("%s", SDL_GetError()), I get exactly what I expected, just not with SDL_ShowSimpleMessageBox.