because of fuckery, we are using the oxalica overlay now

spinnyboy_rust/shell.nix

@@ -1,19 +1,28 @@
-{ pkgs ? import <nixpkgs> {}}:
-let rust-toolchain = with pkgs; symlinkJoin {
-    name = "rust-toolchain";
-    paths = [
-    probe-rs-tools
-    rustup
-    rustc
-      cargo
-      rustfmt
-      rust-analyzer
-      clippy
-      rustPlatform.rustcSrc
+{ pkgs ? import <nixpkgs> {
+    overlays = [
+      (import (builtins.fetchTarball "https://github.com/oxalica/rust-overlay/archive/master.tar.gz"))
     ];
-  };
-in pkgs.mkShell {
-  buildInputs = [rust-toolchain];
-  RUST_SRC_PATH = "${pkgs.rust.packages.stable.rustPlatform.rustLibSrc}";
-  RUST_BACKTRACE = 1;
+  }
+}:
+
+let
+  # Define the specific toolchain with ESP32-C6 support
+  rustToolchain = pkgs.rust-bin.selectLatestNightlyWith(toolchain: toolchain.default.override {
+    targets = [ "riscv32imac-unknown-none-elf" ];
+    extensions = [ "rust-src" "llvm-tools-preview" ];
+  });
+in
+pkgs.mkShell {
+  nativeBuildInputs = [
+    rustToolchain
+    pkgs.probe-rs-tools
+    pkgs.espflash      # For flashing your ESP32-C6
+    pkgs.pkg-config
+    pkgs.gcc           # Critical: provides the 'cc' wrapper script
+  ];
+
+  # Injects necessary library paths for the Nix-wrapped linker
+  shellHook = ''
+    export LD_LIBRARY_PATH="${pkgs.lib.makeLibraryPath [ pkgs.stdenv.cc.cc ]}"
+  '';
 }