diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index a714e34371b4..ad9de1aa3ba0 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -17600,7 +17600,7 @@ in
       inherit (pythonPackages) elpy;
       inherit
         autoconf automake git libffi libpng pkgconfig poppler rtags w3m zlib
-        substituteAll rustPlatform;
+        substituteAll rustPlatform cmake llvmPackages;
     };
   };
 
diff --git a/pkgs/top-level/emacs-packages.nix b/pkgs/top-level/emacs-packages.nix
index f1fdf30f61c2..1975f6aad43e 100644
--- a/pkgs/top-level/emacs-packages.nix
+++ b/pkgs/top-level/emacs-packages.nix
@@ -288,6 +288,45 @@ let
 
   icicles = callPackage ../applications/editors/emacs-modes/icicles { };
 
+  irony = melpaBuild rec {
+    pname = "irony";
+    ename = "irony";
+    version = "20190516";
+    src = fetchFromGitHub {
+      owner = "Sarcasm";
+      repo = "irony-mode";
+      rev = "c3ae899b61124a747ebafc705086345e460ac08e";
+      sha256 = "06ld83vzyklfmrfi6pp893mvlnhacv9if75c9pbipjvy6nwfb63r";
+    };
+    recipe = fetchurl {
+      url = "https://raw.githubusercontent.com/milkypostman/melpa/3cfa28c7314fa57fa9a3aaaadf9ef83f8ae541a9/recipes/irony";
+      sha256 = "1xcxrdrs7imi31nxpszgpaywq4ivni75hrdl4zzrf103xslqpl8a";
+      name = "recipe";
+    };
+    preConfigure = ''
+      cd server
+    '';
+    preBuild = ''
+      make
+    '';
+    postInstall = ''
+      mkdir -p $out
+      mv $out/share/emacs/site-lisp/elpa/*/server/bin $out
+      rm -rf $out/share/emacs/site-lisp/*/server
+    '';
+    preCheck = ''
+      cd source/server
+    '';
+    dontUseCmakeBuildDir = true;
+    doCheck = true;
+    packageRequires = [ emacs ];
+    nativeBuildInputs = [ external.cmake external.llvmPackages.llvm ];
+    meta = {
+      homepage = "https://melpa.org/#/irony";
+      license = lib.licenses.gpl3;
+    };
+  };
+
   redshank = callPackage ../applications/editors/emacs-modes/redshank { };
 
   rtags = melpaBuild rec {