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diff --git a/flake.nix b/flake.nix
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+{
+  description = "Generate documentation for your own projects using the NixOS module system";
+
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-21.05";
+
+  outputs = { self, nixpkgs }:
+    let pkgs = nixpkgs.legacyPackages.x86_64-linux;
+    in
+    {
+
+      lib.modules = {
+        doc-options-md = import ./doc-options-md.nix;
+        mdbook = import ./mdbook.nix;
+        manpage = import ./manpage.nix;
+      };
+
+      checks.x86_64-linux =
+        let
+          evalModules = modules: pkgs.lib.evalModules {
+            modules = [
+              ({ config._module.args = { inherit pkgs; }; })
+            ] ++ modules;
+          };
+          simpleModule = with pkgs.lib; {
+            options.my.simple.module.outputs = mkOption {
+              type = with types; attrsOf package;
+              default = { };
+              description = ''
+                Output products of my simple module system.
+              '';
+            };
+          };
+          params = {
+            outputAttrPath = [ "my" "simple" "module" "outputs" ];
+            optionsAttrPath = [ "my" "simple" "module" "doc" ];
+            optionsInternal = false;
+          };
+
+          simple-manpage = {
+            name = "my simple module system";
+            shortDescription = "A sample module system";
+          };
+
+          advanced-manpage = {
+            name = "my simple module system";
+            section = 5;
+            shortDescription = "A sample module system";
+            description = ''
+              This is a very advanced module system, for advanced people.
+            '';
+
+            textBefore = ''
+              # A SECTION BEFORE
+
+              This is a section before the options.
+            '';
+
+            textAfter = ''
+              # A SECTION AFTER
+
+              This is a section after the options.
+            '';
+          };
+        in
+        {
+          simple-doc-options-md = (evalModules [
+            simpleModule
+            (self.lib.modules.doc-options-md params)
+          ]).config.my.simple.module.outputs.doc-options-md;
+
+          simple-manpage = (evalModules [
+            simpleModule
+            (self.lib.modules.doc-options-md params)
+            (self.lib.modules.manpage params)
+            {
+              my.simple.module.doc.manpage = simple-manpage;
+            }
+          ]).config.my.simple.module.outputs.manpage;
+
+          advanced-manpage = (evalModules [
+            simpleModule
+            (self.lib.modules.doc-options-md params)
+            (self.lib.modules.manpage params)
+            {
+              my.simple.module.doc.manpage = advanced-manpage;
+            }
+          ]).config.my.simple.module.outputs.manpage;
+
+          simple-mdbook = (evalModules [
+            simpleModule
+            (self.lib.modules.doc-options-md params)
+            (self.lib.modules.mdbook params)
+            {
+              my.simple.module.doc.mdbook.src = ./checks/simple-mdbook;
+            }
+          ]).config.my.simple.module.outputs.mdbook;
+
+        };
+
+      devShell.x86_64-linux = pkgs.mkShell {
+        nativeBuildInputs = with pkgs; [ mdbook pandoc ];
+      };
+    };
+}