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-rw-r--r--third_party/default.nix9
1 files changed, 9 insertions, 0 deletions
diff --git a/third_party/default.nix b/third_party/default.nix
index 7cd3b9f2c9d3..14fbe80e7344 100644
--- a/third_party/default.nix
+++ b/third_party/default.nix
@@ -218,6 +218,15 @@ in exposed.lib.fix(self: exposed // {
   clangStdenv = nixpkgs.llvmPackages_10.stdenv;
   stdenv = nixpkgs.llvmPackages_10.stdenv;
 
+  # Provide Emacs 27
+  #
+  # The assert exists because the name of the attribute is unversioned
+  # (which is different from previous versions).
+  emacs27 = assert ((exposed.lib.versions.major nixpkgs.emacs.version) == "27");
+    nixpkgs.emacs;
+  emacs27-nox = assert ((exposed.lib.versions.major nixpkgs.emacs.version) == "27");
+    nixpkgs.emacs-nox;
+
   # The Go authors have released a version of Go (in alpha) that has a
   # type system. This makes it available, specifically for use with
   # //nix/buildTypedGo.