Thank you, now the game can pop up a black screen. The console said:

 ==> Performing warm boot.
   -> Runtime directory is /home/unv/rhombihexadeltille-game/
   -> Resource directory is /home/unv/rhombihexadeltille-game/
 ==> Running boot hooks.
 ==> Reloading foreign libraries.
   -> Loading foreign library #<LIBRARY LIBSDL2-MIXER>.
   -> Loading foreign library #<LIBRARY LIBSDL2-TTF>.
   -> Loading foreign library #<LIBRARY LIBFFI>.
   -> Loading foreign library #<LIBRARY LIBSDL2-IMAGE>.
   -> Loading foreign library #<LIBRARY LIBSDL2>.
   -> Loading foreign library #<LIBRARY OPENGL>.
 ==> Launching application.

debugger invoked on a SDL2::SDL-RC-ERROR in thread
#<THREAD "SDL2 Main Thread" RUNNING {10032B1793}>:
  SDL Error (-1): That operation is not supported

The current thread is not at the foreground,
SB-THREAD:RELEASE-FOREGROUND has to be called in #<SB-THREAD:THREAD "main thread" RUNNING {10005B8083}>
for this thread to enter the debugger.
^C
debugger invoked on a SB-SYS:INTERACTIVE-INTERRUPT in thread
#<THREAD "main thread" RUNNING {10005B8083}>:
  Interactive interrupt at #x7FC5AFD807FB.

Type HELP for debugger help, or (SB-EXT:EXIT) to exit from SBCL.

restarts (invokable by number or by possibly-abbreviated name):
  0: [EXIT ] Exit.
  1: [ABORT] Exit from the current thread.

("bogus stack frame")
0]

I don’t know what is wrong. The error message is arcane to me. :(