uboot: (firmwareOdroidC2/C4) don't invoke patch tool, use patches = [] instead

https://github.com/NixOS/nixpkgs/blob/master/pkgs/stdenv/generic/setup.sh#L948
this can do it nicely.

Signed-off-by: Anton Arapov <anton@deadbeef.mx>

pkgs/applications/science/logic/twelf/default.nix

@@ -0,0 +1,51 @@
+{ lib, stdenv, fetchurl, pkg-config, smlnj, rsync }:
+
+stdenv.mkDerivation rec {
+  pname = "twelf";
+  version = "1.7.1";
+
+  src = fetchurl {
+    url = "http://twelf.plparty.org/releases/twelf-src-${version}.tar.gz";
+    sha256 = "0fi1kbs9hrdrm1x4k13angpjasxlyd1gc3ys8ah54i75qbcd9c4i";
+  };
+
+  nativeBuildInputs = [ pkg-config ];
+  buildInputs = [ smlnj rsync ];
+
+  buildPhase = ''
+    export SMLNJ_HOME=${smlnj}
+    make smlnj
+  '';
+
+  installPhase = ''
+    mkdir -p $out/bin
+    rsync -av bin/{*,.heap} $out/bin/
+    bin/.mkexec ${smlnj}/bin/sml $out/ twelf-server twelf-server
+
+    substituteInPlace emacs/twelf-init.el \
+      --replace '(concat twelf-root "emacs")' '(concat twelf-root "share/emacs/site-lisp/twelf")'
+
+    mkdir -p $out/share/emacs/site-lisp/twelf/
+    rsync -av emacs/ $out/share/emacs/site-lisp/twelf/
+
+    mkdir -p $out/share/twelf/examples
+    rsync -av examples/ $out/share/twelf/examples/
+    mkdir -p $out/share/twelf/vim
+    rsync -av vim/ $out/share/twelf/vim/
+  '';
+
+  meta = {
+    description = "Logic proof assistant";
+    longDescription = ''
+      Twelf is a language used to specify, implement, and prove properties of
+      deductive systems such as programming languages and logics. Large
+      research projects using Twelf include the TALT typed assembly language,
+      a foundational proof-carrying-code system, and a type safety proof for
+      Standard ML.
+    '';
+    homepage = "http://twelf.org/wiki/Main_Page";
+    license = lib.licenses.mit;
+    maintainers = with lib.maintainers; [ jwiegley ];
+    platforms = lib.platforms.unix;
+  };
+}