diff --git a/build/builder.sh b/build/builder.sh
index 2d875ce..27f37f8 100644
--- a/build/builder.sh
+++ b/build/builder.sh
@@ -25,6 +25,12 @@ cp -r $webFiles/* static/
 # Build site with Hugo
 hugo $hugoFlags --config=config.toml,config-urls.toml
 
+# Run Agda to generate HTML files for all Agda projects
+# Agda will write interface files, so make .code/ writable
+chmod -R u+w code
+agdaCommand="agda -l standard-library -i . "
+ruby ./build-agda-html.rb "$agdaCommand"
+
 # Create generated files
 # Can't do submodules because nix flake inputs get their .git deleted
 mkdir -p static/graph && ruby ./analyze.rb > static/graph/graph.gen.js # Graph files
@@ -39,4 +45,6 @@ mkdir $out
 cp -r public/$publicPath/* $out/
 
 # Render math in HTML and XML files.
-find $out/ -regex "$out/.*\.html" | xargs katex-html
+htmlfiles=$(find $out/ -regex "$out/.*\.html")
+echo $htmlfiles | xargs katex-html
+echo $htmlfiles | xargs ${gems}/bin/bundle exec ${ruby}/bin/ruby ./agda.rb
diff --git a/flake.lock b/flake.lock
index 6ea315a..1db6516 100644
--- a/flake.lock
+++ b/flake.lock
@@ -23,11 +23,11 @@
     "blog-source": {
       "flake": false,
       "locked": {
-        "lastModified": 1716424472,
-        "narHash": "sha256-qutuqf3NvqnRGj7A0fbeQBUzapRithWBpsZPr9oNC00=",
+        "lastModified": 1716449496,
+        "narHash": "sha256-8Mt9X3rg17QNljfy7qwqPal/DooqTBx7R+UNm10xRb8=",
         "ref": "refs/heads/master",
-        "rev": "54844fb954d6ef5b397db4c4b2b9f07bce56d73d",
-        "revCount": 766,
+        "rev": "c027efa931b7a248b138467f4c7415d27f02a654",
+        "revCount": 775,
         "submodules": true,
         "type": "git",
         "url": "https://dev.danilafe.com/Web-Projects/blog-static.git"
diff --git a/gemset.nix b/gemset.nix
new file mode 100644
index 0000000..d7dcef5
--- /dev/null
+++ b/gemset.nix
@@ -0,0 +1,33 @@
+{
+  mini_portile2 = {
+    groups = ["default"];
+    platforms = [];
+    source = {
+      remotes = ["https://rubygems.org"];
+      sha256 = "149r94xi6b3jbp6bv72f8383b95ndn0p5sxnq11gs1j9jadv0ajf";
+      type = "gem";
+    };
+    version = "2.8.6";
+  };
+  nokogiri = {
+    dependencies = ["mini_portile2" "racc"];
+    groups = ["default"];
+    platforms = [];
+    source = {
+      remotes = ["https://rubygems.org"];
+      sha256 = "023f2j0q8makgmmfj4pv2fhwgcbh9y8s678za1cb68ry9fdpkkkh";
+      type = "gem";
+    };
+    version = "1.15.6";
+  };
+  racc = {
+    groups = ["default"];
+    platforms = [];
+    source = {
+      remotes = ["https://rubygems.org"];
+      sha256 = "021s7maw0c4d9a6s07vbmllrzqsj2sgmrwimlh8ffkvwqdjrld09";
+      type = "gem";
+    };
+    version = "1.8.0";
+  };
+}
diff --git a/lib.nix b/lib.nix
index 83dc1da..28ce1bd 100644
--- a/lib.nix
+++ b/lib.nix
@@ -5,9 +5,18 @@ with lib;
 
 let
   protocol = ssl: if ssl then "https://" else "http://";
+  gems = bundlerEnv {
+    inherit ruby;
+
+    name = "blog-static-flake";
+    gemfile = "${blog-source}/Gemfile";
+    lockfile = "${blog-source}/Gemfile.lock";
+    gemset = ./gemset.nix;
+  };
+
   website = settings: stdenv.mkDerivation {
     inherit (settings) src ssl host;
-    inherit resume;
+    inherit resume gems ruby;
     name = "blog-static";
     version = settings.src.rev or "dirty";
     publicPath = settings.path;
@@ -18,7 +27,7 @@ let
     builder = ./build/builder.sh;
     webFiles = web-files;
     buildInputs = [
-      hugo ruby stork katex-html
+      hugo ruby stork katex-html (agda.withPackages [ agdaPackages.standard-library ])
     ];
   };
 in