diff --git a/pkgs/development/tools/rtags/default.nix b/pkgs/development/tools/rtags/default.nix
new file mode 100644
index 000000000000..208445c3ec5c
--- /dev/null
+++ b/pkgs/development/tools/rtags/default.nix
@@ -0,0 +1,37 @@
+{ stdenv, fetchgit, cmake, llvm, openssl, clang, writeScript, bash }:
+
+let llvm-config-wrapper = writeScript "llvm-config" ''
+      #! ${bash}/bin/bash
+      if [[ "$1" = "--cxxflags" ]]; then
+        echo $(${llvm}/bin/llvm-config "$@") -isystem ${clang.cc}/include
+      else
+        ${llvm}/bin/llvm-config "$@"
+      fi
+    '';
+
+in stdenv.mkDerivation rec {
+  name = "rtags-${version}";
+  rev = "9fed420d20935faf55770765591fc2de02eeee28";
+  version = "${stdenv.lib.strings.substring 0 7 rev}";
+
+  buildInputs = [ cmake llvm openssl clang ];
+
+  preConfigure = ''
+    export LIBCLANG_LLVM_CONFIG_EXECUTABLE=${llvm-config-wrapper}
+  '';
+
+  src = fetchgit {
+    inherit rev;
+    fetchSubmodules = true;
+    url = "https://github.com/andersbakken/rtags.git";
+    sha256 = "1sb6wfknhvrgirqp65paz7kihv4zgg8g5f7a7i14i10sysalxbif";
+  };
+
+  meta = {
+    description = "C/C++ client-server indexer based on clang";
+
+    homepage = https://github.com/andersbakken/rtags;
+
+    license = stdenv.lib.licenses.gpl3;
+  };
+}
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 1ba07ba0c8e6..f55b0a536d66 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -4716,6 +4716,8 @@ let
     ocaml = ocaml_3_08_0;
   };
 
+  rtags = callPackage ../development/tools/rtags/default.nix {};
+
   rustcMaster = callPackage ../development/compilers/rustc/head.nix {};
   rustc = callPackage ../development/compilers/rustc {};
 
@@ -11387,6 +11389,7 @@ let
     external = {
       inherit (haskellPackages) ghc-mod structured-haskell-mode Agda;
       inherit (pythonPackages) elpy;
+      inherit rtags;
     };
   };
 
diff --git a/pkgs/top-level/emacs-packages.nix b/pkgs/top-level/emacs-packages.nix
index 534fedddcc27..fc75417ec897 100644
--- a/pkgs/top-level/emacs-packages.nix
+++ b/pkgs/top-level/emacs-packages.nix
@@ -706,6 +706,15 @@ let self = _self // overrides;
     meta = { license = bsd3; };
   };
 
+  rtags = melpaBuild rec {
+    pname = "rtags";
+    version = "2.0"; # really, it's some arbitrary git hash
+    src = external.rtags.src;
+    propagatedUserEnvPkgs = [ external.rtags ];
+    fileSpecs = [ "src/*.el" ];
+    inherit (external.rtags) meta;
+  };
+
   git-auto-commit-mode = melpaBuild rec {
     pname = "git-auto-commit-mode";
     version = "4.4.0";