treewide: fix types for mkDerivation params

pkgs/tools/text/mdcat/default.nix

@@ -12,7 +12,7 @@ rustPlatform.buildRustPackage rec {
   };
 
   nativeBuildInputs = [ pkgconfig ];
-  buildInputs = [ (stdenv.lib.optional stdenv.isDarwin Security) openssl ];
+  buildInputs = [ openssl ] ++ stdenv.lib.optional stdenv.isDarwin Security;
 
   cargoSha256 = "1hxsfls6fpllc9yg5ib3qz6pa62j1y1va8a6356j6812csk4ifnn";
 

pkgs/tools/text/reckon/default.nix

@@ -4,17 +4,17 @@ stdenv.mkDerivation rec {
   pname = "reckon";
   version = (import ./gemset.nix).reckon.version;
 
-  env = bundlerEnv {
-    name = "${pname}-${version}-gems";
-
-    gemdir = ./.;
-  };
-
   phases = [ "installPhase" ];
 
   buildInputs = [ makeWrapper ];
 
-  installPhase = ''
+  installPhase = let
+    env = bundlerEnv {
+      name = "${pname}-${version}-gems";
+
+      gemdir = ./.;
+    };
+  in ''
     mkdir -p $out/bin
     makeWrapper ${env}/bin/reckon $out/bin/reckon
   '';