diff --git a/horizon.dhall b/horizon.dhall
index 3aeb6c00b547e5d31c499ac2025f809093a409ba..ee955e1b05d62b9e3b69f5b2edc66cefeac422c9 100644
--- a/horizon.dhall
+++ b/horizon.dhall
@@ -58,6 +58,7 @@ in  H.HorizonExport.MakePackageSet
           , H.callHackage "QuickCheck" "2.14.2"
           , H.callHackage "SHA" "1.6.4.4"
           , H.callHackage "StateVar" "1.2.2"
+          , H.callHackage "X11" "1.10.3"
           , H.callHackage "abstract-deque" "0.3"
           , H.callHackage "abstract-par" "0.3.3"
           , H.callHackage "adjunctions" "4.4.2"
diff --git a/initial-packages.nix b/initial-packages.nix
index 533bd73406202736ed66fcb524f0fe3ecfc23f72..b9e96a9296069a17c48a4758776c0bf58df28080 100644
--- a/initial-packages.nix
+++ b/initial-packages.nix
@@ -49,6 +49,8 @@ self: with pkgs.haskell.lib; {
 
   StateVar = self.callPackage (./pkgs/StateVar.nix) { };
 
+  X11 = self.callPackage (./pkgs/X11.nix) { };
+
   abstract-deque = self.callPackage (./pkgs/abstract-deque.nix) { };
 
   abstract-par = self.callPackage (./pkgs/abstract-par.nix) { };
diff --git a/pkgs/X11.nix b/pkgs/X11.nix
new file mode 100644
index 0000000000000000000000000000000000000000..a188124bef2130a8a299f34c53d2c0da8bd63da4
--- /dev/null
+++ b/pkgs/X11.nix
@@ -0,0 +1,39 @@
+{ mkDerivation
+, base
+, data-default-class
+, lib
+, libX11
+, libXScrnSaver
+, libXext
+, libXinerama
+, libXrandr
+, libXrender
+}:
+mkDerivation {
+  pname = "X11";
+  version = "1.10.3";
+  sha256 = "d84ad1b8f5cdb65a0de17f84d765ebbb7aeeab9608c3740804da28100616d242";
+  isLibrary = true;
+  isExecutable = false;
+  enableSeparateDataOutput = false;
+  libraryHaskellDepends = [ base data-default-class ];
+  librarySystemDepends = [
+    libX11
+    libXext
+    libXinerama
+    libXrandr
+    libXrender
+    libXScrnSaver
+  ];
+  enableLibraryProfiling = true;
+  enableExecutableProfiling = true;
+  doHaddock = false;
+  jailbreak = true;
+  doCheck = false;
+  doBenchmark = false;
+  hyperlinkSource = false;
+  homepage = "https://github.com/xmonad/X11";
+  description = "A binding to the X11 graphics library";
+  license = lib.licenses.bsd3;
+  broken = false;
+}