Indeed!  :-)

Deleting the offending file and installing Swing, did the trick! ;-)

(On a Debian oldstable based distro), after successfully completing configure, make fails, complaining that "Makefile:720: recipe for target 'py_adonthell_wrap.o' failed".

The full console output, is here:

make  all-recursive
make[1]: Entering directory '/home/giorgos/TEMPG/adonthell-0.3.8'
Making all in m4
make[2]: Entering directory '/home/giorgos/TEMPG/adonthell-0.3.8/m4'
make[2]: Nothing to be done for 'all'.
make[2]: Leaving directory '/home/giorgos/TEMPG/adonthell-0.3.8/m4'
Making all in po
make[2]: Entering directory '/home/giorgos/TEMPG/adonthell-0.3.8/po'
make[2]: Nothing to be done for 'all'.
make[2]: Leaving directory '/home/giorgos/TEMPG/adonthell-0.3.8/po'
Making all in src
make[2]: Entering directory '/home/giorgos/TEMPG/adonthell-0.3.8/src'
Making all in .
make[3]: Entering directory '/home/giorgos/TEMPG/adonthell-0.3.8/src'
  CXX      achievements.o
  CXX      adonthell.o
  CXX      animation.o
  CXX      audio.o
  CXX      character_base.o
  CXX      character.o
  CXX      data_screen.o
  CXX      dialog.o
  CXX      dialog_screen.o
  CXX      drawable.o
  CXX      drawing_area.o
  CXX      event.o
  CXX      event_handler.o
  CXX      event_list.o
  CXX      fileops.o
  CXX      game.o
  CXX      gamedata.o
  CXX      gamedate.o
  CXX      gametime.o
  CXX      image.o
  CXX      input.o
  CXX      label.o
  CXX      label_input.o
  CXX      landmap.o
  CXX      lex.prefs.o
  CXX      map_event.o
  CXX      map_event_handler.o
  CXX      mapsquare_walkable.o
  CXX      mapcharacter.o
  CXX      mapsquare.o
  CXX      mapobject.o
  CXX      mapview.o
  CXX      nls.o
  CXX      path.o
  CXX      pnm.o
  CXX      prefs.o
  CXX      python_class.o
  CXX      py_adonthell_wrap.o
py_adonthell_wrap.cc: In function ‘PyObject* SDLK_APP1_swigconstant(PyObject*, PyObject*)’:
py_adonthell_wrap.cc:10034:75: error: ‘SDLK_APP1’ was not declared in this scope
   SWIG_Python_SetConstant(d, "SDLK_APP1",SWIG_From_int(static_cast< int >(SDLK_APP1)));
                                                                           ^~~~~~~~~
py_adonthell_wrap.cc: In function ‘PyObject* SDLK_APP2_swigconstant(PyObject*, PyObject*)’:
py_adonthell_wrap.cc:10045:75: error: ‘SDLK_APP2’ was not declared in this scope
   SWIG_Python_SetConstant(d, "SDLK_APP2",SWIG_From_int(static_cast< int >(SDLK_APP2)));
                                                                           ^~~~~~~~~
py_adonthell_wrap.cc: In function ‘PyObject* SDLK_AUDIOREWIND_swigconstant(PyObject*, PyObject*)’:
py_adonthell_wrap.cc:10056:82: error: ‘SDLK_AUDIOREWIND’ was not declared in this scope
   SWIG_Python_SetConstant(d, "SDLK_AUDIOREWIND",SWIG_From_int(static_cast< int >(SDLK_AUDIOREWIND)));
                                                                                  ^~~~~~~~~~~~~~~~
py_adonthell_wrap.cc: In function ‘PyObject* SDLK_AUDIOFASTFORWARD_swigconstant(PyObject*, PyObject*)’:
py_adonthell_wrap.cc:10067:87: error: ‘SDLK_AUDIOFASTFORWARD’ was not declared in this scope
   SWIG_Python_SetConstant(d, "SDLK_AUDIOFASTFORWARD",SWIG_From_int(static_cast< int >(SDLK_AUDIOFASTFORWARD)));
                                                                                       ^~~~~~~~~~~~~~~~~~~~~
Makefile:720: recipe for target 'py_adonthell_wrap.o' failed
make[3]: * [py_adonthell_wrap.o] Error 1
make[3]: Leaving directory '/home/giorgos/TEMPG/adonthell-0.3.8/src'
Makefile:740: recipe for target 'all-recursive' failed
make[2]: * [all-recursive] Error 1
make[2]: Leaving directory '/home/giorgos/TEMPG/adonthell-0.3.8/src'
Makefile:509: recipe for target 'all-recursive' failed
make[1]: * [all-recursive] Error 1
make[1]: Leaving directory '/home/giorgos/TEMPG/adonthell-0.3.8'
Makefile:405: recipe for target 'all' failed
make: * [all] Error 2