diff -ru ltris-1.2.2.orig/configure ltris-1.2.2/configure

--- ltris-1.2.2.orig/configure	2020-12-28 12:58:30.000000000 +0100

+++ ltris-1.2.2/configure	2021-01-12 16:47:35.063828462 +0100

@@ -9089,8 +9089,8 @@

   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/'`

@@ -9249,8 +9249,8 @@

   rm -f conf.sdltest

-CFLAGS="$CFLAGS $(sdl-config --cflags)"

-LIBS="$LIBS $(sdl-config --libs)"

+CFLAGS="$CFLAGS $(PKG_CONFIG --cflags sdl)"

+LIBS="$LIBS $(PKG_CONFIG --libs sdl)"

 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for main in -lSDL_mixer" >&5

 $as_echo_n "checking for main in -lSDL_mixer... " >&6; }