--- a/configure	Sat Jun 02 19:59:29 2007 +0000
+++ b/configure	Sat Jul 14 19:42:58 2007 +0000
@@ -45,8 +45,8 @@
 
 set_default
 detect_params "$@"
+check_params
 save_params
-check_params
 make_cflags_and_ldflags
 
 EXE=""
@@ -83,6 +83,7 @@
 		deep += 1;
 
 		if ($0 == "SDL"         && "'$sdl_config'" == "")          { next; }
+		if ($0 == "PNG"         && "'$png_config'" == "")          { next; }
 		if ($0 == "OSX"         && "'$os'" != "OSX")               { next; }
 		if ($0 == "OS2"         && "'$os'" != "OS2")               { next; }
 		if ($0 == "PSP"         && "'$os'" != "PSP")               { next; }