diff -r 80967361f257 -r 21e542c15832 configure.ac
--- a/configure.ac	Thu Mar 14 19:37:53 2024 +0100
+++ b/configure.ac	Fri Mar 15 20:57:49 2024 +0100
@@ -41,10 +41,15 @@
 fi
 
 WIRINGPI=No
-AC_CHECK_LIB(wiringPi,wiringPiSetup,result=yes,result=no)
-if test "$result" = "yes"; then
-  LIBS="$LIBS -lwiringPi -lwiringPiDev"
-  AC_CHECK_HEADERS(wiringPi.h,WIRINGPI=Yes,WIRINGPI=No)
+AC_ARG_ENABLE(wiringpi,  [  --enable-wiringpi       Compile wiringPi code],     [ wiringpi=$enableval ], [ wiringpi=yes ])
+if test "$wiringpi" = "yes"; then
+  AC_CHECK_LIB(wiringPi,wiringPiSetup,result=yes,result=no)
+  if test "$result" = "yes"; then
+    LIBS="$LIBS -lwiringPi -lwiringPiDev"
+    AC_CHECK_HEADERS(wiringPi.h,WIRINGPI=Yes,WIRINGPI=No)
+  fi
+else
+  AC_MSG_RESULT(check wiringPi disabled)
 fi
 
 AC_CHECK_LIB(json-c,json_object_iter_init_default,result=yes,result=no)
@@ -101,40 +106,40 @@
 SDL_CFLAGS=""
 SDL_LIBS=""
 SDL="No"
-AC_MSG_CHECKING(SDL library)
+AC_MSG_CHECKING(SDL2 library)
 pkg-config --exists sdl
 if test "$?" = "0"; then
   AC_MSG_RESULT(yes)
-  AC_MSG_CHECKING(sdl library v1.2.0 or newer)
-  pkg-config --atleast-version=1.2.0 sdl
+  AC_MSG_CHECKING(sdl2 library v2.0.0 or newer)
+  pkg-config --atleast-version=2.0.0 sdl2
   if test "$?" = "0"; then
     AC_MSG_RESULT(found)
   else
     AC_MSG_ERROR(not found)
   fi
-  SDL_CFLAGS="$(pkg-config --cflags sdl)"
-  SDL_LIBS="$(pkg-config --libs sdl)"
-  AC_CHECK_HEADERS(SDL/SDL.h)
+  SDL_CFLAGS="$(pkg-config --cflags sdl2)"
+  SDL_LIBS="$(pkg-config --libs sdl2)"
+  AC_CHECK_HEADERS(SDL2/SDL.h)
   SDL="Yes"
 else
   AC_MSG_RESULT(no)
 fi
 
 # Check for SDL_ttf
-AC_MSG_CHECKING(SDL_ttf library)
-pkg-config --exists SDL_ttf
+AC_MSG_CHECKING(SDL2_ttf library)
+pkg-config --exists SDL2_ttf
 if test "$?" = "0"; then
   AC_MSG_RESULT(yes)
-  AC_MSG_CHECKING(sdl library v2.0.0 or newer)
-  pkg-config --atleast-version=2.0.0 SDL_ttf
+  AC_MSG_CHECKING(sdl2 library v2.0.0 or newer)
+  pkg-config --atleast-version=2.0.0 SDL2_ttf
   if test "$?" = "0"; then
     AC_MSG_RESULT(found)
   else
     AC_MSG_ERROR(not found)
   fi
   # Override flags
-  SDL_CFLAGS="$(pkg-config --cflags SDL_ttf)"
-  SDL_LIBS="$(pkg-config --libs SDL_ttf)"
+  SDL_CFLAGS="$(pkg-config --cflags SDL2_ttf)"
+  SDL_LIBS="$(pkg-config --libs SDL2_ttf)"
 else
   AC_MSG_RESULT(no)
 fi
@@ -158,7 +163,7 @@
     Version : ............ ${VERSION}
     Main directory : ..... ${prefix}
     WiringPi : ........... ${WIRINGPI}
-    SDL library : ........ ${SDL}
+    SDL2 library : ....... ${SDL}
     Simulator : .......... ${SIMULATOR}
 
   Now type 'make' and 'sudo make install'