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/development/libraries/physics/hepmc3/default.nix

@@ -0,0 +1,49 @@
+{ lib, stdenv, fetchurl, cmake, coreutils, python, root }:
+
+let
+  pythonVersion = with lib.versions; "${major python.version}${minor python.version}";
+  withPython = python != null;
+  # ensure that root is built with the same python interpreter, as it links against numpy
+  root_py = if withPython then root.override { inherit python; } else root;
+in
+
+stdenv.mkDerivation rec {
+  pname = "hepmc3";
+  version = "3.2.5";
+
+  src = fetchurl {
+    url = "http://hepmc.web.cern.ch/hepmc/releases/HepMC3-${version}.tar.gz";
+    sha256 = "sha256-zQ91yA91VJxZzCqCns52Acd96Xyypat1eQysjh1YUDI=";
+  };
+
+  nativeBuildInputs = [ cmake ];
+  buildInputs = [ root_py ]
+    ++ lib.optional withPython python;
+
+  cmakeFlags = [
+    "-DHEPMC3_ENABLE_PYTHON=${if withPython then "ON" else "OFF"}"
+  ] ++ lib.optionals withPython [
+    "-DHEPMC3_PYTHON_VERSIONS=${if python.isPy3k then "3.X" else "2.X"}"
+    "-DHEPMC3_Python_SITEARCH${pythonVersion}=${placeholder "out"}/${python.sitePackages}"
+  ];
+
+  postInstall = ''
+    substituteInPlace "$out"/bin/HepMC3-config \
+      --replace 'greadlink' '${coreutils}/bin/readlink' \
+      --replace 'readlink' '${coreutils}/bin/readlink'
+  '';
+
+  doInstallCheck = withPython;
+  # prevent nix from trying to dereference a null python
+  installCheckPhase = lib.optionalString withPython ''
+    PYTHONPATH=${placeholder "out"}/${python.sitePackages} python -c 'import pyHepMC3'
+  '';
+
+  meta = with lib; {
+    description = "The HepMC package is an object oriented, C++ event record for High Energy Physics Monte Carlo generators and simulation";
+    license = licenses.gpl3;
+    homepage = "http://hepmc.web.cern.ch/hepmc/";
+    platforms = platforms.unix;
+    maintainers = with maintainers; [ veprbl ];
+  };
+}