diff --git a/configs/packages.nix b/configs/packages.nix
index 9da698c..aa24ba8 100644
--- a/configs/packages.nix
+++ b/configs/packages.nix
@@ -2,6 +2,7 @@
 let
   scripts = import ../dot/scripts.nix { inherit pkgs lib; };
   daybook = pkgs.callPackage ../packages/daybook.nix {};
+  iolanguage = pkgs.callPackage ../packages/iolanguage.nix {};
   todoist = pkgs.callPackage ../packages/todoist {};
   unstable = import <nixos-unstable> {};
 in with pkgs;
@@ -54,6 +55,7 @@ in with pkgs;
     unzip
     unrar
     p7zip
+    zip
   ] ++ [ # monitor
     htop
     iotop
@@ -134,6 +136,7 @@ in with pkgs;
     haskellPackages.hindent
     haskellPackages.hoogle
     hlint
+    iolanguage
     lua
     mypy
     nix-prefetch-git
@@ -143,6 +146,7 @@ in with pkgs;
     python36Packages.black
     python36Packages.flake8
     racket-minimal
+    ruby
     rustup
     scala
     shellcheck
diff --git a/packages/daybook.nix b/packages/daybook.nix
index 92b21e2..276ad0d 100644
--- a/packages/daybook.nix
+++ b/packages/daybook.nix
@@ -10,8 +10,8 @@ stdenv.mkDerivation {
   nativeBuildInputs = [ makeWrapper ];
   buildInputs = [ pandoc ];
   buildPhase = ''
-    mkdir -p $out/share/man/man1
-    pandoc --standalone --to man daybook.1.md -o $out/share/man/man1/daybook.1
+    mkdir -p $out/man/man1
+    pandoc --standalone --to man daybook.1.md -o $out/man/man1/daybook.1
   '';
   installPhase = ''
     mkdir -p $out/bin
diff --git a/packages/iolanguage.nix b/packages/iolanguage.nix
new file mode 100644
index 0000000..9a768f2
--- /dev/null
+++ b/packages/iolanguage.nix
@@ -0,0 +1,23 @@
+{ stdenv, cmake, python3, fetchFromGitHub }:
+stdenv.mkDerivation rec {
+  version = "2017.09.06";
+  name = "iolanguage-${version}";
+  src = fetchFromGitHub {
+    owner = "IoLanguage";
+    repo = "io";
+    rev = "${version}";
+    sha256 = "07rg1zrz6i6ghp11cm14w7bbaaa1s8sb0y5i7gr2sds0ijlpq223";
+    fetchSubmodules = true;
+  };
+  buildInputs = [ cmake python3 ];
+  preBuild = "mkdir -p build && cd build";
+  buildPhase = ''
+    cmake -DCMAKE_INSTALL_PREFIX=$out/ ..
+    make all
+  '';
+  meta = with stdenv.lib; {
+    homepage = https://iolanguage.org/;
+    description = "Io programming language. Inspired by Self, Smalltalk and LISP.";
+    license = licenses.bsd3;
+  };
+}