diff --git a/emacs.nix b/emacs.nix
index 3dad08b24..913f8de7e 100644
--- a/emacs.nix
+++ b/emacs.nix
@@ -1,163 +1,22 @@
 # Derivation for Emacs pre-configured with packages that I need.
+#
+# TODO: Fix sly (again)
 
 { pkgs }:
 
-with pkgs.unstable; with emacsPackagesNg;
+with pkgs; with emacsPackagesNg;
 let emacsWithPackages = (emacsPackagesNgGen emacs).emacsWithPackages;
 
-# The nix-mode in the official repositories is old and annoying to
-# work with, pin it to something newer instead:
-nix-mode = emacsPackagesNg.melpaBuild {
-  pname   = "nix-mode";
-  version = "20180306";
-
-  src = fetchFromGitHub {
-    owner  = "NixOS";
-    repo   = "nix-mode";
-    rev    = "0ac0271f6c8acdbfddfdbb1211a1972ae562ec17";
-    sha256 = "157vy4xkvaqd76km47sh41wykbjmfrzvg40jxgppnalq9pjxfinp";
-  };
-
-  recipeFile = writeText "nix-mode-recipe" ''
-    (nix-mode :repo "NixOS/nix-mode" :fetcher github
-              :files (:defaults (:exclude "nix-mode-mmm.el")))
-  '';
-};
-
-jsonrpc = emacsPackagesNg.elpaBuild rec {
-  pname   = "jsonrpc";
-  version = "1.0.0";
-
-  src = fetchurl {
-    url    = "https://elpa.gnu.org/packages/jsonrpc-${version}.el";
-    sha256 = "06lmmn7j2ilkvwibbpgnd8p6d63fjjnxd2ma8f4jw6vrz1f7lwvs";
-  };
-};
-
-eglot = emacsPackagesNg.melpaBuild rec {
-  pname = "eglot";
-  version = "1.1";
-
-  src = fetchurl {
-    url    = "https://elpa.gnu.org/packages/eglot-${version}.tar";
-    sha256 = "01h4wh87lrd9l50y20gjjkgg760v8ixvbcb3q8jykl29989zw62y";
-  };
-
-  packageRequires = [ jsonrpc ];
-};
-
-# ivy has not been updated in unstable for a while:
-ivySource = fetchFromGitHub {
-  owner  = "abo-abo";
-  repo   = "swiper";
-  rev    = "6f2939485d33e9b28022d3b6912a50669dcdd596";
-  sha256 = "1f2i6hkcbiqdw7fr9vabsm32a0gy647llzki6b97yv8vwa0klh2q";
-};
-
-withIvySources = pname: recipe: emacsPackagesNg.melpaBuild {
-  inherit pname;
-  version = "20180616";
-  recipeFile = builtins.toFile "${pname}-recipe" recipe;
-  src = ivySource;
-};
-
-newIvy.ivy = withIvySources "ivy" ''
-(ivy :files (:defaults
-             (:exclude "swiper.el" "counsel.el" "ivy-hydra.el")
-             "doc/ivy-help.org"))
-'';
-
-newIvy.counsel = withIvySources "counsel" ''
-(counsel :files ("counsel.el"))
-'';
-
-newIvy.swiper = withIvySources "swiper" ''
-(swiper :files ("swiper.el"))
-'';
-
-newIvy.ivy-pass = melpaBuild {
-  pname = "ivy-pass";
-  version = "20170812";
-  src = fetchFromGitHub {
-    owner  = "ecraven";
-    repo   = "ivy-pass";
-    rev    = "5b523de1151f2109fdd6a8114d0af12eef83d3c5";
-    sha256 = "18crb4zh2pjf0cmv3b913m9vfng27girjwfqc3mk7vqd1r5a49yk";
-  };
-};
-
-counsel-notmuch = melpaBuild {
-  pname   = "counsel-notmuch";
-  version = "20171223";
-
-  packageRequires = [
-    newIvy.ivy
-    pkgs.notmuch
-  ];
-
-  src = fetchFromGitHub {
-    owner  = "fuxialexander";
-    repo   = "counsel-notmuch";
-    rev    = "ac1aaead81c6860d7b8324cc1c00bcd52de5e9ca";
-    sha256 = "19frcrz6bx7d7v1hkg0xv7zmbk2sydlsdzn1s96cqzjk1illchkz";
-  };
-};
-
-# prescient & ivy-prescient provide better filtering in ivy/counsel,
-# but they are not in nixpkgs yet:
-prescientSource = fetchFromGitHub {
-  owner  = "raxod502";
-  repo   = "prescient.el";
-  rev    = "27c94636489d5b062970a0f7e9041ca186b6b659";
-  sha256 = "05jk8cms48dhpbaimmx3akmnq32fgbc0q4dja7lvpvssmq398cn7";
-};
-
-prescient = emacsPackagesNg.melpaBuild {
-  pname   = "prescient";
-  version = "1.0";
-  src     = prescientSource;
-
-  recipeFile = writeText "prescient-recipe" ''
-    (prescient :files ("prescient.el"))
-  '';
-};
-
-ivy-prescient = emacsPackagesNg.melpaBuild {
-  pname   = "ivy-prescient";
-  version = "1.0";
-  src     = prescientSource;
-  packageRequires = [ prescient newIvy.ivy ];
-
-  recipeFile = writeText "ivy-prescient-recipe" ''
-    (ivy-prescient :files ("ivy-prescient.el"))
-  '';
-};
-
-sly = emacsPackagesNg.melpaBuild {
-  pname           = "sly";
-  version         = "20180613";
-  packageRequires = [ elpaPackages.company ];
-
-  src = fetchFromGitHub {
-    owner  = "joaotavora";
-    repo   = "sly";
-    rev    = "a05b45f1564a86a9d49707c9c570da6c3a56b6e5";
-    sha256 = "1c9xzppxlnak1px0dv0ljpp4izfj4377lncvrcb1jaiyh8z8ry48";
-  };
-
-  recipeFile = writeText "sly-recipe" ''
-    (sly :files ("*.el"
-                 ("lib" "lib/*")
-                 ("contrib" "contrib/*")))
-  '';
-};
-
 # As the EXWM-README points out, XELB should be built from source if
 # EXWM is.
 xelb = melpaBuild {
   pname   = "xelb";
   ename   = "xelb";
   version = "0.15";
+  recipe  = builtins.toFile "recipe" ''
+    (xelb :fetcher github
+          :repo "ch11ng/xelb")
+  '';
 
   packageRequires = [ cl-generic emacs ];
 
@@ -175,6 +34,10 @@ exwm = melpaBuild {
   pname   = "exwm";
   ename   = "exwm";
   version = "0.19";
+  recipe  = builtins.toFile "recipe" ''
+    (exwm :fetcher github
+          :repo "ch11ng/exwm")
+  '';
 
   packageRequires = [ xelb ];
 
@@ -201,21 +64,28 @@ in emacsWithPackages(epkgs:
 
   # MELPA packages:
   (with epkgs.melpaPackages; [
-    alchemist
     browse-kill-ring
     cargo
+    counsel
+    counsel-notmuch
     dash
     dash-functional
     dockerfile-mode
     edit-server
+    eglot
     elixir-mode
     erlang
+    exwm
     go-mode
     gruber-darker-theme
     haskell-mode
     ht
     hydra
     idle-highlight-mode
+    intero
+    ivy
+    ivy-pass
+    ivy-prescient
     jq-mode
     kotlin-mode
     magit
@@ -224,15 +94,20 @@ in emacsWithPackages(epkgs:
     multi-term
     multiple-cursors
     nginx-mode
+    nix-mode
     paredit
     password-store
     pg
+    pkgs.notmuch
+    prescient
     rainbow-delimiters
     restclient
     rust-mode
     s
+    # sly
     smartparens
     string-edit
+    swiper
     telephone-line
     terraform-mode
     toml-mode
@@ -243,14 +118,6 @@ in emacsWithPackages(epkgs:
     yaml-mode
   ]) ++
 
-  # Stable packages
-  (with epkgs.melpaStablePackages; [
-    intero
-  ]) ++
-
-  # Use custom updated ivy packages
-  (lib.attrValues newIvy) ++
-
   # Custom packaged Emacs packages:
-  [ nix-mode eglot prescient ivy-prescient counsel-notmuch pkgs.notmuch sly exwm ]
+  [ xelb exwm ]
 )