Building sdlada is ok, via alr, is ok, but the running step fails ($ alr run).

sdlada_2.5.20_cd53c280$ alr run
ⓘ Running pre-build actions for sdlada=2.5.20...                            
make : on entre dans le répertoire « /media/dubois/4To/Donnees/Courrier/020-Ada/X-Bibliotheque/sdlada_2.5.20_cd53c280/build/gnat »
mkdir -p gen/src/
make : on quitte le répertoire « /media/dubois/4To/Donnees/Courrier/020-Ada/X-Bibliotheque/sdlada_2.5.20_cd53c280/build/gnat »
ⓘ Building sdlada=2.5.20/build/gnat/sdlada.gpr...
✓ Build finished successfully in 0.47 seconds.
error: Executable "sdlada" not found
dubois@db:/media/dubois/4To/Donnees/Courrier/020-Ada/X-Bibliotheque/sdlada_2.5.20_cd53c280
$ 

-And second issue, the “with sdlada” fails on :

$ ./gnatmake -P unit_tests.gpr
--------------------------------
Compilation du unit_tests
--------------------------------
Compile
   [Ada]          unit_tests.adb
unit_tests.adb:28:06: error: file "aunit.ads" not found
unit_tests.adb:29:06: error: file "aunit.ads" not found
unit_tests.adb:30:06: error: file "aunit.ads" not found
unit_tests.adb:30:06: error: "Unit_Tests (body)" depends on "Sdl_Suites (spec)"
unit_tests.adb:30:06: error: "Sdl_Suites (spec)" depends on "Aunit (spec)"
gprbuild: *** compilation phase failed
$ 

with unit_tests.adb as:

with AUnit.Run;
with AUnit.Reporter.Text;
with SDL_Suites;

procedure Unit_Tests is
 etc..

Thanks
Mark