diff --git a/.gitignore b/.gitignore
index 6c59b33..221f1d8 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,6 +1,7 @@
 .build
 build
 depends
+result
 *~
 quox
 quox-tests
diff --git a/flake.nix b/flake.nix
index 7b126f7..d0a46e8 100644
--- a/flake.nix
+++ b/flake.nix
@@ -14,16 +14,24 @@
           inherit system;
           overlays = [ idris2-pkgs.overlay ];
         };
+        builders = pkgs.idris2-pkgs._builders;
 
-        inherit (pkgs.idris2-pkgs._builders) idrisPackage;
+        packages =
+          let inherit (builders) idrisPackage;
+          in rec {
+            quox-lib   = idrisPackage ./lib   { };
+            quox       = idrisPackage ./exe   { extraPkgs = packages; };
+            quox-tests = idrisPackage ./tests { extraPkgs = packages; };
+          };
 
-        quox-lib   = idrisPackage ./lib   { };
-        quox       = idrisPackage ./exe   { extraPkgs.quox-lib = quox-lib; };
-        quox-tests = idrisPackage ./tests { extraPkgs.quox-lib = quox-lib; };
-      in
-      {
-        packages = { inherit quox-lib quox quox-tests; };
-        defaultPackage = quox;
+        devShells =
+          let mkDevShell = _: pkg:
+                pkgs.mkShell { buildInputs = [ (builders.devEnv pkg) ]; };
+          in builtins.mapAttrs mkDevShell packages;
+      in {
+        inherit packages devShells;
+        defaultPackage = packages.quox;
+        devShell = devShells.quox-lib;
       }
     );
 }