diff --git a/.envrc b/.envrc
new file mode 100644
index 00000000..3550a30f
--- /dev/null
+++ b/.envrc
@@ -0,0 +1 @@
+use flake
diff --git a/package.nix b/package.nix
index 07041423..0fbe85a8 100644
--- a/package.nix
+++ b/package.nix
@@ -190,6 +190,7 @@ stdenv.mkDerivation (finalAttrs: {
     postgresql_13
     pixz
     nix-eval-jobs
+    perlPackages.PLS
   ];
 
   checkInputs = [