diff -ru dosbox-0.74-3.orig/configure dosbox-0.74-3/configure
--- dosbox-0.74-3.orig/configure	2019-06-26 16:55:12.000000000 +0200
+++ dosbox-0.74-3/configure	2020-09-25 16:20:13.964548319 +0200
@@ -4954,8 +4954,8 @@
   if test "$SDL_CONFIG" = "no" ; then
     no_sdl=yes
   else
-    SDL_CFLAGS=`$SDL_CONFIG $sdlconf_args --cflags`
-    SDL_LIBS=`$SDL_CONFIG $sdlconf_args --libs`
+    SDL_CFLAGS=`$PKG_CONFIG --cflags sdl`
+    SDL_LIBS=`$PKG_CONFIG --libs sdl`
 
     sdl_major_version=`$SDL_CONFIG $sdl_args --version | \
            sed 's/\([0-9]*\).\([0-9]*\).\([0-9]*\)/\1/'`
@@ -7083,64 +7083,6 @@
 fi
 
 
-{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for main in -lX11" >&5
-$as_echo_n "checking for main in -lX11... " >&6; }
-if ${ac_cv_lib_X11_main+:} false; then :
-  $as_echo_n "(cached) " >&6
-else
-  ac_check_lib_save_LIBS=$LIBS
-LIBS="-lX11  $LIBS"
-cat confdefs.h - <<_ACEOF >conftest.$ac_ext
-/* end confdefs.h.  */
-
-
-int
-main ()
-{
-return main ();
-  ;
-  return 0;
-}
-_ACEOF
-if ac_fn_c_try_link "$LINENO"; then :
-  ac_cv_lib_X11_main=yes
-else
-  ac_cv_lib_X11_main=no
-fi
-rm -f core conftest.err conftest.$ac_objext \
-    conftest$ac_exeext conftest.$ac_ext
-LIBS=$ac_check_lib_save_LIBS
-fi
-{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_X11_main" >&5
-$as_echo "$ac_cv_lib_X11_main" >&6; }
-if test "x$ac_cv_lib_X11_main" = xyes; then :
-  have_x11_lib=yes
-else
-  have_x11_lib=no
-fi
-
-ac_fn_c_check_header_mongrel "$LINENO" "X11/XKBlib.h" "ac_cv_header_X11_XKBlib_h" "$ac_includes_default"
-if test "x$ac_cv_header_X11_XKBlib_h" = xyes; then :
-  have_x11_h=yes
-else
-  have_x11_h=no
-fi
-
-
-{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for XKBlib support" >&5
-$as_echo_n "checking for XKBlib support... " >&6; }
-if test x$have_x11_lib = xyes -a x$have_x11_h = xyes ; then
-   LIBS="$LIBS -lX11"
-   $as_echo "#define C_X11_XKB 1" >>confdefs.h
-
-   { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
-$as_echo "yes" >&6; }
-else
-   { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
-$as_echo "no" >&6; }
-fi
-
-
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for main in -lGL" >&5
 $as_echo_n "checking for main in -lGL... " >&6; }
 if ${ac_cv_lib_GL_main+:} false; then :