diff --git a/.envrc b/.envrc
new file mode 100644
index 0000000..1229831
--- /dev/null
+++ b/.envrc
@@ -0,0 +1,6 @@
+# shellcheck shell=bash
+if command -v cl6x &>/dev/null; then
+  export C6X_C_DIR="$(dirname "$(dirname "$(realpath "$(command -v cl6x)")")")"
+  C6X_C_DIR="$C6X_C_DIR/include;$C6X_C_DIR/lib"
+fi
+# ex: filetype=sh
diff --git a/shell.nix b/shell.nix
deleted file mode 100644
index 19fd5ff..0000000
--- a/shell.nix
+++ /dev/null
@@ -1,14 +0,0 @@
-{
-  pkgs ? import <nixpkgs> { },
-}:
-
-with pkgs;
-mkShell {
-  name = "src";
-  shellHook = ''
-    if command -v cl6x &>/dev/null; then
-      export C6X_C_DIR="$(dirname "$(dirname "$(realpath "$(command -v cl6x)")")")"
-      C6X_C_DIR="$C6X_C_DIR/include;$C6X_C_DIR/lib"
-    fi
-  '';
-}