diff --git a/blueprint/src/macro/print.tex b/blueprint/src/macro/print.tex
index 512425e3..e5975285 100644
--- a/blueprint/src/macro/print.tex
+++ b/blueprint/src/macro/print.tex
@@ -11,6 +11,8 @@
 % We neutralise the Plastex commands
 \newcommand{\uses}[1]{}
 \newcommand{\proves}[1]{}
+\newcommand{\discussion}[1]{}
 \newcommand{\lean}[1]{}
 \newcommand{\leanok}{}
+\newcommand{\mathlibok}{}
 \newcommand{\tangled}{}
diff --git a/lake-manifest.json b/lake-manifest.json
index 6063e29d..e0feadbf 100644
--- a/lake-manifest.json
+++ b/lake-manifest.json
@@ -63,6 +63,15 @@
    "manifestFile": "lake-manifest.json",
    "inputRev": null,
    "inherited": false,
+   "configFile": "lakefile.lean"},
+  {"url": "https://github.com/PatrickMassot/checkdecls.git",
+   "type": "git",
+   "subDir": null,
+   "rev": "2ee81a0269048010900117b675876a1d8db5883c",
+   "name": "checkdecls",
+   "manifestFile": "lake-manifest.json",
+   "inputRev": null,
+   "inherited": false,
    "configFile": "lakefile.lean"}],
  "name": "FLT",
  "lakeDir": ".lake"}
diff --git a/lakefile.lean b/lakefile.lean
index 5b8f0093..dd22ff92 100644
--- a/lakefile.lean
+++ b/lakefile.lean
@@ -25,6 +25,8 @@ package FLT where
 
 require mathlib from git "https://github.com/leanprover-community/mathlib4.git"
 
+require checkdecls from git "https://github.com/PatrickMassot/checkdecls.git"
+
 -- This is run only if we're in `dev` mode. This is so not everyone has to build doc-gen
 meta if get_config? env = some "dev" then
 require «doc-gen4» from git