diff --git a/.fdignore b/.fdignore
new file mode 100644
index 0000000..24d76ea
--- /dev/null
+++ b/.fdignore
@@ -0,0 +1 @@
+testdata/
diff --git a/impure.nix b/impure.nix
deleted file mode 100644
index 472e232..0000000
--- a/impure.nix
+++ /dev/null
@@ -1,3 +0,0 @@
-# Slimmed down shell.nix for users who have Rust pre-installed
-with import <nixpkgs> { };
-mkShell { buildInputs = [ pkgconfig openssl ]; }