diff -ruN nix-0.10pre5679/scripts/nix-prefetch-url.in nix-0.10pre5679.new/scripts/nix-prefetch-url.in
--- nix-0.10pre5679/scripts/nix-prefetch-url.in	2006-07-11 13:24:20.000000000 +0200
+++ nix-0.10pre5679.new/scripts/nix-prefetch-url.in	2006-08-01 11:54:02.000000000 +0200
@@ -39,10 +39,10 @@
 
     tmpPath=/tmp/nix-prefetch-url-$$ # !!! security?
     tmpFile=$tmpPath/$name
-    mkdir $tmpPath
+    mkdir -p $NIX_ROOT/$tmpPath
 
     # Perform the download.
-    @curl@ --fail --location --max-redirs 20 "$url" > $tmpFile
+    @curl@ --fail --location --max-redirs 20 "$url" > $NIX_ROOT/$tmpFile
 
     # Compute the hash.
     hash=$(@bindir@/nix-hash --type "$hashType" $hashFormat --flat $tmpFile)
@@ -51,7 +51,7 @@
     # Add the downloaded file to the Nix store.
     finalPath=$(@bindir@/nix-store --add-fixed "$hashType" $tmpFile)
 
-    if test -n "$tmpPath"; then rm -rf $tmpPath || true; fi
+    if test -n "$NIX_ROOT/$tmpPath"; then rm -rf $NIX_ROOT/$tmpPath || true; fi
 
     if test -n "$expHash" -a "$expHash" != "$hash"; then
         echo "hash mismatch for URL \`$url'"