opkg-utils: new package

Helper scripts for use with the opkg package manager.

Upstream doesn't do releases it seems, so I'm packaging the latest git
version.

pkgs/tools/package-management/opkg-utils/default.nix

···
+{ stdenv, fetchgit }:
+
+stdenv.mkDerivation rec {
+  name = "opkg-utils-20141030";
+
+  # No releases, only a git tree
+  src = fetchgit {
+    url = "git://git.yoctoproject.org/opkg-utils";
+    rev = "762d9dadce548108d4204c2113461a7dd6f57e60";
+    sha256 = "a450643fa1353b872166a3d462297fb2eb240554eed7a9186645ffd72b353417";
+  };
+
+  preBuild = ''
+    makeFlagsArray+=(PREFIX="$out")
+  '';
+
+  meta = with stdenv.lib; {
+    description = "Helper scripts for use with the opkg package manager";
+    homepage = http://git.yoctoproject.org/cgit/cgit.cgi/opkg-utils/;
+    license = licenses.gpl2;
+    platforms = platforms.all;
+    maintainers = [ maintainers.bjornfor ];
+  };
+}

pkgs/top-level/all-packages.nix

···
 
   opkg = callPackage ../tools/package-management/opkg { };
 
+  opkg-utils = callPackage ../tools/package-management/opkg-utils { };
+
   pgadmin = callPackage ../applications/misc/pgadmin { };
 
   pgf = pgf2;