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-rw-r--r--default.nix3
1 files changed, 1 insertions, 2 deletions
diff --git a/default.nix b/default.nix
index ae99da5..8308389 100644
--- a/default.nix
+++ b/default.nix
@@ -1,5 +1,4 @@
-with import <nixpkgs> {};
-
+with import (fetchTarball "https://github.com/NixOS/nixpkgs/archive/269fc4ddb896c1c5994eb4bb8c750ec18cb3db82.tar.gz") {};
let
ncoq = coq_8_12;
ncoqPackages = coqPackages_8_12;