diff --git a/.envrc b/.envrc
new file mode 100644
index 00000000000..b2bc1a3521d
--- /dev/null
+++ b/.envrc
@@ -0,0 +1,4 @@
+if ! has nix_direnv_version || ! nix_direnv_version 2.3.0; then
+  source_url "https://raw.githubusercontent.com/nix-community/nix-direnv/2.3.0/direnvrc" "sha256-Dmd+j63L84wuzgyjITIfSxSD57Tx7v51DMxVZOsiUD8="
+fi
+use nix
diff --git a/keyboards/idobao/id75/keymaps/viva/idobao_id75_v1_viva.json b/keyboards/idobao/id75/keymaps/viva/idobao_id75_v1_viva.json
new file mode 100644
index 00000000000..cfcff015b18
--- /dev/null
+++ b/keyboards/idobao/id75/keymaps/viva/idobao_id75_v1_viva.json
@@ -0,0 +1,319 @@
+{
+  "version": 1,
+  "notes": "",
+  "documentation": "\"This file is a QMK Configurator export. You can import this at <https://config.qmk.fm>. It can also be used directly with QMK's source code.\n\nTo setup your QMK environment check out the tutorial: <https://docs.qmk.fm/#/newbs>\n\nYou can convert this file to a keymap.c using this command: `qmk json2c {keymap}`\n\nYou can compile this keymap using this command: `qmk compile {keymap}`\"\n",
+  "keyboard": "idobao/id75/v1",
+  "keymap": "idobao_id75_v1_viva",
+  "layout": "LAYOUT_ortho_5x15",
+  "layers": [
+    [
+      "KC_ESC",
+      "KC_1",
+      "KC_2",
+      "KC_3",
+      "KC_4",
+      "KC_5",
+      "KC_INS",
+      "KC_HOME",
+      "KC_PGUP",
+      "KC_6",
+      "KC_7",
+      "KC_8",
+      "KC_9",
+      "KC_0",
+      "KC_BSPC",
+      "KC_TAB",
+      "KC_Q",
+      "KC_W",
+      "KC_E",
+      "KC_R",
+      "KC_T",
+      "KC_DEL",
+      "KC_END",
+      "KC_PGDN",
+      "KC_Y",
+      "KC_U",
+      "KC_I",
+      "KC_O",
+      "KC_P",
+      "KC_BSLS",
+      "KC_LCTL",
+      "KC_A",
+      "KC_S",
+      "KC_D",
+      "KC_F",
+      "KC_G",
+      "KC_MINS",
+      "KC_GRV",
+      "KC_EQL",
+      "KC_H",
+      "KC_J",
+      "KC_K",
+      "KC_L",
+      "KC_SCLN",
+      "KC_QUOT",
+      "KC_LSFT",
+      "KC_Z",
+      "KC_X",
+      "KC_C",
+      "KC_V",
+      "KC_B",
+      "KC_LBRC",
+      "KC_UP",
+      "KC_RBRC",
+      "KC_N",
+      "KC_M",
+      "KC_COMM",
+      "KC_DOT",
+      "KC_SLSH",
+      "KC_ENT",
+      "KC_LGUI",
+      "KC_COPY",
+      "KC_PSTE",
+      "KC_LALT",
+      "MO(1)",
+      "KC_SPC",
+      "KC_LEFT",
+      "KC_DOWN",
+      "KC_RGHT",
+      "KC_SPC",
+      "MO(2)",
+      "KC_VOLD",
+      "KC_VOLU",
+      "MO(3)",
+      "KC_RGUI"
+    ],
+    [
+      "KC_TRNS",
+      "KC_F1",
+      "KC_F2",
+      "KC_F3",
+      "KC_F4",
+      "KC_F5",
+      "KC_F6",
+      "KC_F7",
+      "KC_F8",
+      "KC_F9",
+      "KC_F10",
+      "KC_F11",
+      "KC_F12",
+      "KC_F13",
+      "KC_F14",
+      "KC_TRNS",
+      "KC_EXLM",
+      "KC_AT",
+      "KC_LCBR",
+      "KC_RCBR",
+      "KC_PIPE",
+      "KC_NO",
+      "KC_NO",
+      "KC_NO",
+      "KC_NO",
+      "KC_NO",
+      "KC_NO",
+      "KC_NO",
+      "KC_NO",
+      "KC_NO",
+      "KC_TRNS",
+      "KC_HASH",
+      "KC_DLR",
+      "KC_LPRN",
+      "KC_RPRN",
+      "KC_GRV",
+      "KC_NO",
+      "KC_NO",
+      "KC_NO",
+      "KC_LEFT",
+      "KC_DOWN",
+      "KC_UP",
+      "KC_RGHT",
+      "KC_NO",
+      "KC_NO",
+      "KC_TRNS",
+      "KC_PERC",
+      "KC_CIRC",
+      "KC_LBRC",
+      "KC_RBRC",
+      "KC_TILD",
+      "KC_NO",
+      "KC_NO",
+      "KC_NO",
+      "KC_NO",
+      "KC_NO",
+      "KC_NO",
+      "KC_NO",
+      "KC_NO",
+      "KC_NO",
+      "KC_TRNS",
+      "KC_NO",
+      "KC_NO",
+      "KC_TRNS",
+      "KC_TRNS",
+      "KC_TRNS",
+      "KC_NO",
+      "KC_NO",
+      "KC_NO",
+      "KC_TRNS",
+      "KC_TRNS",
+      "KC_NO",
+      "KC_NO",
+      "KC_TRNS",
+      "KC_TRNS"
+    ],
+    [
+      "KC_NO",
+      "RALT(KC_1)",
+      "RALT(KC_2)",
+      "RALT(KC_3)",
+      "RALT(KC_4)",
+      "RALT(KC_5)",
+      "KC_NO",
+      "KC_NO",
+      "KC_NO",
+      "RALT(KC_6)",
+      "RALT(KC_7)",
+      "RALT(KC_8)",
+      "RALT(KC_9)",
+      "RALT(KC_0)",
+      "KC_NO",
+      "KC_NO",
+      "RALT(KC_Q)",
+      "RALT(KC_W)",
+      "RALT(KC_E)",
+      "RALT(KC_R)",
+      "RALT(KC_T)",
+      "KC_NO",
+      "KC_NO",
+      "KC_NO",
+      "RALT(KC_Y)",
+      "RALT(KC_U)",
+      "RALT(KC_I)",
+      "RALT(KC_O)",
+      "RALT(KC_P)",
+      "RALT(KC_BSLS)",
+      "KC_NO",
+      "RALT(KC_A)",
+      "RALT(KC_S)",
+      "RALT(KC_D)",
+      "RALT(KC_F)",
+      "RALT(KC_G)",
+      "RALT(KC_MINS)",
+      "RALT(KC_GRV)",
+      "RALT(KC_EQL)",
+      "RALT(KC_H)",
+      "RALT(KC_J)",
+      "RALT(KC_K)",
+      "RALT(KC_L)",
+      "RALT(KC_SCLN)",
+      "RALT(KC_QUOT)",
+      "KC_NO",
+      "RALT(KC_Z)",
+      "RALT(KC_X)",
+      "RALT(KC_C)",
+      "RALT(KC_V)",
+      "RALT(KC_B)",
+      "RALT(KC_LBRC)",
+      "KC_NO",
+      "RALT(KC_RBRC)",
+      "RALT(KC_N)",
+      "RALT(KC_M)",
+      "RALT(KC_COMM)",
+      "RALT(KC_DOT)",
+      "RALT(KC_SLSH)",
+      "KC_NO",
+      "KC_NO",
+      "KC_NO",
+      "KC_NO",
+      "KC_TRNS",
+      "KC_TRNS",
+      "KC_TRNS",
+      "KC_NO",
+      "KC_NO",
+      "KC_NO",
+      "KC_TRNS",
+      "KC_TRNS",
+      "KC_NO",
+      "KC_NO",
+      "KC_TRNS",
+      "KC_TRNS"
+    ],
+    [
+      "RGB_TOG",
+      "KC_NO",
+      "KC_NO",
+      "KC_NO",
+      "KC_NO",
+      "KC_NO",
+      "KC_NO",
+      "KC_NO",
+      "KC_NO",
+      "KC_NO",
+      "KC_NO",
+      "KC_NO",
+      "KC_NO",
+      "KC_NO",
+      "NK_ON",
+      "KC_NO",
+      "KC_NO",
+      "KC_NO",
+      "KC_NO",
+      "KC_NO",
+      "KC_NO",
+      "KC_NO",
+      "KC_NO",
+      "KC_NO",
+      "KC_NO",
+      "KC_NO",
+      "KC_NO",
+      "KC_NO",
+      "KC_NO",
+      "KC_NO",
+      "KC_NO",
+      "KC_NO",
+      "KC_NO",
+      "KC_NO",
+      "KC_NO",
+      "KC_NO",
+      "KC_NO",
+      "KC_NO",
+      "KC_NO",
+      "KC_NO",
+      "KC_NO",
+      "KC_NO",
+      "KC_NO",
+      "KC_NO",
+      "KC_NO",
+      "KC_NO",
+      "KC_NO",
+      "KC_NO",
+      "KC_NO",
+      "KC_NO",
+      "KC_NO",
+      "KC_NO",
+      "KC_NO",
+      "KC_NO",
+      "KC_NO",
+      "KC_NO",
+      "KC_NO",
+      "KC_NO",
+      "KC_NO",
+      "KC_NO",
+      "KC_NO",
+      "KC_NO",
+      "KC_NO",
+      "KC_NO",
+      "KC_TRNS",
+      "KC_NO",
+      "KC_NO",
+      "KC_NO",
+      "KC_NO",
+      "KC_NO",
+      "KC_TRNS",
+      "KC_NO",
+      "KC_NO",
+      "KC_TRNS",
+      "KC_NO"
+    ]
+  ],
+  "author": ""
+}
\ No newline at end of file
diff --git a/keyboards/idobao/id75/keymaps/viva/keymap.c b/keyboards/idobao/id75/keymaps/viva/keymap.c
new file mode 100644
index 00000000000..1ad61865ded
--- /dev/null
+++ b/keyboards/idobao/id75/keymaps/viva/keymap.c
@@ -0,0 +1,25 @@
+#include QMK_KEYBOARD_H
+#if __has_include("keymap.h")
+#    include "keymap.h"
+#endif
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+    [0] = LAYOUT_ortho_5x15(
+        KC_ESC, KC_1, KC_2, KC_3, KC_4, KC_5, KC_INS, KC_HOME, KC_PGUP, KC_6, KC_7, KC_8, KC_9, KC_0, KC_BSPC, KC_TAB, KC_Q, KC_W, KC_E, KC_R, KC_T, KC_DEL, KC_END, KC_PGDN, KC_Y, KC_U, KC_I, KC_O, KC_P, KC_BSLS, KC_LCTL, KC_A, KC_S, KC_D, KC_F, KC_G, KC_MINS, KC_GRV, KC_EQL, KC_H, KC_J, KC_K, KC_L, KC_SCLN, KC_QUOT, KC_LSFT, KC_Z, KC_X, KC_C, KC_V, KC_B, KC_LBRC, KC_UP, KC_RBRC, KC_N, KC_M, KC_COMM, KC_DOT, KC_SLSH, KC_ENT, KC_LGUI, KC_COPY, KC_PSTE, KC_LALT, MO(1), KC_SPC, KC_LEFT, KC_DOWN, KC_RGHT, KC_SPC, MO(2), KC_VOLD, KC_VOLU, MO(3), KC_RGUI
+    ),
+    [1] = LAYOUT_ortho_5x15(
+        KC_TRNS, KC_F1, KC_F2, KC_F3, KC_F4, KC_F5, KC_F6, KC_F7, KC_F8, KC_F9, KC_F10, KC_F11, KC_F12, KC_F13, KC_F14, KC_TRNS, KC_EXLM, KC_AT, KC_LCBR, KC_RCBR, KC_PIPE, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_TRNS, KC_HASH, KC_DLR, KC_LPRN, KC_RPRN, KC_GRV, KC_NO, KC_NO, KC_NO, KC_LEFT, KC_DOWN, KC_UP, KC_RGHT, KC_NO, KC_NO, KC_TRNS, KC_PERC, KC_CIRC, KC_LBRC, KC_RBRC, KC_TILD, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_TRNS, KC_NO, KC_NO, KC_TRNS, KC_TRNS, KC_TRNS, KC_NO, KC_NO, KC_NO, KC_TRNS, KC_TRNS, KC_NO, KC_NO, KC_TRNS, KC_TRNS
+    ),
+    [2] = LAYOUT_ortho_5x15(
+        KC_NO, RALT(KC_1), RALT(KC_2), RALT(KC_3), RALT(KC_4), RALT(KC_5), KC_NO, KC_NO, KC_NO, RALT(KC_6), RALT(KC_7), RALT(KC_8), RALT(KC_9), RALT(KC_0), KC_NO, KC_NO, RALT(KC_Q), RALT(KC_W), RALT(KC_E), RALT(KC_R), RALT(KC_T), KC_NO, KC_NO, KC_NO, RALT(KC_Y), RALT(KC_U), RALT(KC_I), RALT(KC_O), RALT(KC_P), RALT(KC_BSLS), KC_NO, RALT(KC_A), RALT(KC_S), RALT(KC_D), RALT(KC_F), RALT(KC_G), RALT(KC_MINS), RALT(KC_GRV), RALT(KC_EQL), RALT(KC_H), RALT(KC_J), RALT(KC_K), RALT(KC_L), RALT(KC_SCLN), RALT(KC_QUOT), KC_NO, RALT(KC_Z), RALT(KC_X), RALT(KC_C), RALT(KC_V), RALT(KC_B), RALT(KC_LBRC), KC_NO, RALT(KC_RBRC), RALT(KC_N), RALT(KC_M), RALT(KC_COMM), RALT(KC_DOT), RALT(KC_SLSH), KC_NO, KC_NO, KC_NO, KC_NO, KC_TRNS, KC_TRNS, KC_TRNS, KC_NO, KC_NO, KC_NO, KC_TRNS, KC_TRNS, KC_NO, KC_NO, KC_TRNS, KC_TRNS
+    ),
+    [3] = LAYOUT_ortho_5x15(
+        RGB_TOG, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, NK_ON, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_TRNS, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_TRNS, KC_NO, KC_NO, KC_TRNS, KC_NO
+    )
+};
+
+#if defined(ENCODER_ENABLE) && defined(ENCODER_MAP_ENABLE)
+const uint16_t PROGMEM encoder_map[][NUM_ENCODERS][NUM_DIRECTIONS] = {
+
+};
+#endif // defined(ENCODER_ENABLE) && defined(ENCODER_MAP_ENABLE)
diff --git a/keyboards/xiudi/xd75/keymaps/viva/keymap.c b/keyboards/xiudi/xd75/keymaps/viva/keymap.c
new file mode 100644
index 00000000000..1ad61865ded
--- /dev/null
+++ b/keyboards/xiudi/xd75/keymaps/viva/keymap.c
@@ -0,0 +1,25 @@
+#include QMK_KEYBOARD_H
+#if __has_include("keymap.h")
+#    include "keymap.h"
+#endif
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+    [0] = LAYOUT_ortho_5x15(
+        KC_ESC, KC_1, KC_2, KC_3, KC_4, KC_5, KC_INS, KC_HOME, KC_PGUP, KC_6, KC_7, KC_8, KC_9, KC_0, KC_BSPC, KC_TAB, KC_Q, KC_W, KC_E, KC_R, KC_T, KC_DEL, KC_END, KC_PGDN, KC_Y, KC_U, KC_I, KC_O, KC_P, KC_BSLS, KC_LCTL, KC_A, KC_S, KC_D, KC_F, KC_G, KC_MINS, KC_GRV, KC_EQL, KC_H, KC_J, KC_K, KC_L, KC_SCLN, KC_QUOT, KC_LSFT, KC_Z, KC_X, KC_C, KC_V, KC_B, KC_LBRC, KC_UP, KC_RBRC, KC_N, KC_M, KC_COMM, KC_DOT, KC_SLSH, KC_ENT, KC_LGUI, KC_COPY, KC_PSTE, KC_LALT, MO(1), KC_SPC, KC_LEFT, KC_DOWN, KC_RGHT, KC_SPC, MO(2), KC_VOLD, KC_VOLU, MO(3), KC_RGUI
+    ),
+    [1] = LAYOUT_ortho_5x15(
+        KC_TRNS, KC_F1, KC_F2, KC_F3, KC_F4, KC_F5, KC_F6, KC_F7, KC_F8, KC_F9, KC_F10, KC_F11, KC_F12, KC_F13, KC_F14, KC_TRNS, KC_EXLM, KC_AT, KC_LCBR, KC_RCBR, KC_PIPE, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_TRNS, KC_HASH, KC_DLR, KC_LPRN, KC_RPRN, KC_GRV, KC_NO, KC_NO, KC_NO, KC_LEFT, KC_DOWN, KC_UP, KC_RGHT, KC_NO, KC_NO, KC_TRNS, KC_PERC, KC_CIRC, KC_LBRC, KC_RBRC, KC_TILD, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_TRNS, KC_NO, KC_NO, KC_TRNS, KC_TRNS, KC_TRNS, KC_NO, KC_NO, KC_NO, KC_TRNS, KC_TRNS, KC_NO, KC_NO, KC_TRNS, KC_TRNS
+    ),
+    [2] = LAYOUT_ortho_5x15(
+        KC_NO, RALT(KC_1), RALT(KC_2), RALT(KC_3), RALT(KC_4), RALT(KC_5), KC_NO, KC_NO, KC_NO, RALT(KC_6), RALT(KC_7), RALT(KC_8), RALT(KC_9), RALT(KC_0), KC_NO, KC_NO, RALT(KC_Q), RALT(KC_W), RALT(KC_E), RALT(KC_R), RALT(KC_T), KC_NO, KC_NO, KC_NO, RALT(KC_Y), RALT(KC_U), RALT(KC_I), RALT(KC_O), RALT(KC_P), RALT(KC_BSLS), KC_NO, RALT(KC_A), RALT(KC_S), RALT(KC_D), RALT(KC_F), RALT(KC_G), RALT(KC_MINS), RALT(KC_GRV), RALT(KC_EQL), RALT(KC_H), RALT(KC_J), RALT(KC_K), RALT(KC_L), RALT(KC_SCLN), RALT(KC_QUOT), KC_NO, RALT(KC_Z), RALT(KC_X), RALT(KC_C), RALT(KC_V), RALT(KC_B), RALT(KC_LBRC), KC_NO, RALT(KC_RBRC), RALT(KC_N), RALT(KC_M), RALT(KC_COMM), RALT(KC_DOT), RALT(KC_SLSH), KC_NO, KC_NO, KC_NO, KC_NO, KC_TRNS, KC_TRNS, KC_TRNS, KC_NO, KC_NO, KC_NO, KC_TRNS, KC_TRNS, KC_NO, KC_NO, KC_TRNS, KC_TRNS
+    ),
+    [3] = LAYOUT_ortho_5x15(
+        RGB_TOG, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, NK_ON, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_TRNS, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_TRNS, KC_NO, KC_NO, KC_TRNS, KC_NO
+    )
+};
+
+#if defined(ENCODER_ENABLE) && defined(ENCODER_MAP_ENABLE)
+const uint16_t PROGMEM encoder_map[][NUM_ENCODERS][NUM_DIRECTIONS] = {
+
+};
+#endif // defined(ENCODER_ENABLE) && defined(ENCODER_MAP_ENABLE)
diff --git a/shell.nix b/shell.nix
index 88822b0b17e..752017e30e7 100644
--- a/shell.nix
+++ b/shell.nix
@@ -1,72 +1,11 @@
-let
-  # We specify sources via Niv: use "niv update nixpkgs" to update nixpkgs, for example.
-  sources = import ./util/nix/sources.nix { };
-in
-# However, if you want to override Niv's inputs, this will let you do that.
-{ pkgs ? import sources.nixpkgs { }
-, poetry2nix ? pkgs.callPackage (import sources.poetry2nix) { }
-, avr ? true
-, arm ? true
-, teensy ? true }:
-with pkgs;
-let
-  avrlibc = pkgsCross.avr.libcCross;
+with (import <nixpkgs> {});
 
-  avr_incflags = [
-    "-isystem ${avrlibc}/avr/include"
-    "-B${avrlibc}/avr/lib/avr5"
-    "-L${avrlibc}/avr/lib/avr5"
-    "-B${avrlibc}/avr/lib/avr35"
-    "-L${avrlibc}/avr/lib/avr35"
-    "-B${avrlibc}/avr/lib/avr51"
-    "-L${avrlibc}/avr/lib/avr51"
+mkShell {
+  buildInputs = [
+    qmk
   ];
 
-  # Builds the python env based on nix/pyproject.toml and
-  # nix/poetry.lock Use the "poetry update --lock", "poetry add
-  # --lock" etc. in the nix folder to adjust the contents of those
-  # files if the requirements*.txt files change
-  pythonEnv = poetry2nix.mkPoetryEnv {
-    projectDir = ./util/nix;
-    overrides = poetry2nix.overrides.withDefaults (self: super: {
-      qmk = super.qmk.overridePythonAttrs(old: {
-        # Allow QMK CLI to run "qmk" as a subprocess (the wrapper changes
-        # $PATH and breaks these invocations).
-        dontWrapPythonPrograms = true;
-
-        # Fix "qmk setup" to use the Python interpreter from the environment
-        # when invoking "qmk doctor" (sys.executable gets its value from
-        # $NIX_PYTHONEXECUTABLE, which is set by the "qmk" wrapper from the
-        # Python environment, so "qmk doctor" then runs with the proper
-        # $NIX_PYTHONPATH too, because sys.executable actually points to
-        # another wrapper from the same Python environment).
-        postPatch = ''
-          substituteInPlace qmk_cli/subcommands/setup.py \
-            --replace "[Path(sys.argv[0]).as_posix()" \
-              "[Path(sys.executable).as_posix(), Path(sys.argv[0]).as_posix()"
-        '';
-      });
-    });
-  };
-in
-mkShell {
-  name = "qmk-firmware";
-
-  buildInputs = [ clang-tools_11 dfu-programmer dfu-util diffutils git pythonEnv niv ]
-    ++ lib.optional avr [
-      pkgsCross.avr.buildPackages.binutils
-      pkgsCross.avr.buildPackages.gcc8
-      avrlibc
-      avrdude
-    ]
-    ++ lib.optional arm [ gcc-arm-embedded ]
-    ++ lib.optional teensy [ teensy-loader-cli ];
-
-  AVR_CFLAGS = lib.optional avr avr_incflags;
-  AVR_ASFLAGS = lib.optional avr avr_incflags;
   shellHook = ''
-    # Prevent the avr-gcc wrapper from picking up host GCC flags
-    # like -iframework, which is problematic on Darwin
-    unset NIX_CFLAGS_COMPILE_FOR_TARGET
+    # empty so far
   '';
 }