* nix-prefetch-url depends on sed (see

http://hydra.nixos.org/build/311170).

configure.ac

@@ -149,6 +149,7 @@ AC_PATH_PROG(w3m, w3m, false)
 AC_PATH_PROG(flex, flex, false)
 AC_PATH_PROG(bison, bison, false)
 NEED_PROG(perl, perl)
+NEED_PROG(sed, sed)
 NEED_PROG(tar, tar)
 AC_PATH_PROG(dot, dot)
 AC_PATH_PROG(dblatex, dblatex)

scripts/nix-prefetch-url.in

@@ -24,7 +24,7 @@ fi
 # Handle escaped characters in the URI.  `+', `=' and `?' are the only
 # characters that are valid in Nix store path names but have a special
 # meaning in URIs.
-name=$(basename "$url" | sed -e 's/%2b/+/g' -e 's/%3d/=/g' -e 's/%3f/\?/g')
+name=$(basename "$url" | @sed@ -e 's/%2b/+/g' -e 's/%3d/=/g' -e 's/%3f/\?/g')
 if test -z "$name"; then echo "invalid url"; exit 1; fi
 
 

substitute.mk

@@ -16,6 +16,7 @@
 	 -e "s^@bzip2_bin_test\@^$(bzip2_bin_test)^g" \
 	 -e "s^@perl\@^$(perl)^g" \
 	 -e "s^@coreutils\@^$(coreutils)^g" \
+	 -e "s^@sed\@^$(sed)^g" \
 	 -e "s^@tar\@^$(tar)^g" \
 	 -e "s^@gzip\@^$(gzip)^g" \
 	 -e "s^@tr\@^$(tr)^g" \