Will McCammon writes:

make fails for busybox 1.0.0 on fedora core 2
because the default behavior of wget is to create
a directory structure of the remote download
server on the local filesystem.  in which case,
tar cannot find successfully downloaded files in
/buildroot/sources/dl.  patch attached.
diff --git a/Config.in b/Config.in
index 3062393..df5607f 100644
--- a/Config.in
+++ b/Config.in
@@ -60,7 +60,7 @@
 
 config BR2_WGET
 	string
-	default "wget --passive-ftp"
+	default "wget --passive-ftp -nd"
 
 config BR2_TAR_VERBOSITY
 	bool