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The variable used for passing arguments to sdl-config in the m4 macro is inconsistently named, resulting in incorrect operation when using the --with-sdl-prefix argument to the configure script. Three different variable names are used, sdl_args, sdlconf_args, and sdl_config_args.

The following patch converts all of them to use the name sdl_config_args, which fixes the problems with --with-sdl-prefix :

--- sdl.m4    2007-08-20 14:42:32.000000000 +0100
+++ sdl.m4    2007-08-20 14:43:27.000000000 +0100
@@ -20,13 +20,13 @@
                    , enable_sdltest=yes)
 
   if test x$sdl_exec_prefix != x ; then
-    sdl_args="$sdl_args --exec-prefix=$sdl_exec_prefix"
+    sdl_config_args="$sdl_config_args --exec-prefix=$sdl_exec_prefix"
     if test x${SDL_CONFIG+set} != xset ; then
       SDL_CONFIG=$sdl_exec_prefix/bin/sdl-config
     fi
   fi
   if test x$sdl_prefix != x ; then
-    sdl_args="$sdl_args --prefix=$sdl_prefix"
+    sdl_config_args="$sdl_config_args --prefix=$sdl_prefix"
     if test x${SDL_CONFIG+set} != xset ; then
       SDL_CONFIG=$sdl_prefix/bin/sdl-config
     fi
@@ -42,12 +42,12 @@
   if test "$SDL_CONFIG" = "no" ; then
     no_sdl=yes
   else
-    SDL_CFLAGS=`$SDL_CONFIG $sdlconf_args --cflags`
-    SDL_LIBS=`$SDL_CONFIG $sdlconf_args --libs`
+    SDL_CFLAGS=`$SDL_CONFIG $sdl_config_args --cflags`
+    SDL_LIBS=`$SDL_CONFIG $sdl_config_args --libs`
 
-    sdl_major_version=`$SDL_CONFIG $sdl_args --version | \
+    sdl_major_version=`$SDL_CONFIG $sdl_config_args --version | \
            sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\1/'`
-    sdl_minor_version=`$SDL_CONFIG $sdl_args --version | \
+    sdl_minor_version=`$SDL_CONFIG $sdl_config_args --version | \
            sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\2/'`
     sdl_micro_version=`$SDL_CONFIG $sdl_config_args --version | \
            sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\3/'`