flake.nix: temporarily pin nixpkgs version

This is the last bump of the nixpkgs-unstable channel before the
DocBookalypse.

1 files changed, 3 insertions, 0 deletions

diff --git a/flake.nix b/flake.nix
index 3ce6db1..c571bc5 100644
--- a/flake.nix
+++ b/flake.nix
@@ -2,6 +2,9 @@
   # WARNING this is very much still experimental.
   description = "A collection of darwin modules";
 
+  # Temporary pin for Markdown documentation transition.
+  inputs.nixpkgs.url = "nixpkgs/c1bca7fe84c646cfd4ebf3482c0e6317a0b13f22";
+
   outputs = { self, nixpkgs }: {
     lib = {
       # TODO handle multiple architectures.