Apparently libtool cannot be installed separately from autoconf

and automake. Copying the files in $libtool/share/aclocal to 
$autoconf/share/aclocal does not work (and causes collisions when
installing the tools in the user environment). The solution seems to
be to install the three distributions in one single $out directory,
i.e., consider them as one package.
 

svn path=/nixpkgs/trunk/; revision=597

pkgs/development/tools/misc/libtool/default.nix

@@ -1,6 +1,6 @@
 {stdenv, fetchurl, m4, perl}:
 derivation {
-  name = "autoconf-2.58";
+  name = "libtool-1.5";
   system = stdenv.system;
   builder = ./builder.sh;
   src = fetchurl {