Merge branch 'master' into staging-next

Quite many rebuilds from master:
> Estimating rebuild amount by counting changed Hydra jobs.
>    3926 x86_64-darwin
>    4645 x86_64-linux

pkgs/development/interpreters/cyclone/default.nix

@@ -0,0 +1,47 @@
+{ stdenv, fetchFromGitHub, libck, darwin }:
+
+let
+  version = "0.21";
+  bootstrap = stdenv.mkDerivation {
+    pname = "cyclone-bootstrap";
+    inherit version;
+
+    src = fetchFromGitHub {
+      owner = "justinethier";
+      repo = "cyclone-bootstrap";
+      rev = "v${version}";
+      sha256 = "0bb3a7x7vzmdyhm4nilm8bcn4q50pwqryggnxz21n16v6xakwjmr";
+    };
+
+    nativeBuildInputs = stdenv.lib.optionals stdenv.isDarwin [ darwin.cctools ];
+
+    buildInputs = [ libck ];
+
+    makeFlags = [ "PREFIX=${placeholder "out"}" ];
+  };
+in
+stdenv.mkDerivation {
+  pname = "cyclone";
+  inherit version;
+
+  src = fetchFromGitHub {
+    owner = "justinethier";
+    repo = "cyclone";
+    rev = "v${version}";
+    sha256 = "1vb4yaprs2bwbxmxx2zkqvysxx8r9qww2q1nqkz8yps3ji715jw7";
+  };
+
+  nativeBuildInputs = [ bootstrap ]
+    ++ stdenv.lib.optionals stdenv.isDarwin [ darwin.cctools ];
+
+  buildInputs = [ libck ];
+
+  makeFlags = [ "PREFIX=${placeholder "out"}" ];
+
+  meta = with stdenv.lib; {
+    homepage = "https://justinethier.github.io/cyclone/";
+    description = "A brand-new compiler that allows practical application development using R7RS Scheme";
+    license = licenses.mit;
+    maintainers = with maintainers; [ siraben ];
+  };
+}