diff --git a/pkgs/development/tools/parsing/nex/default.nix b/pkgs/development/tools/parsing/nex/default.nix
new file mode 100644
index 000000000000000..287098ed8d363e2
--- /dev/null
+++ b/pkgs/development/tools/parsing/nex/default.nix
@@ -0,0 +1,27 @@
+{ buildGoPackage
+, fetchFromGitHub
+, lib
+}:
+# upstream is pretty stale, but it still works, so until they merge module
+# support we have to use gopath: see blynn/nex#57
+buildGoPackage rec {
+  pname = "nex";
+  version = "unstable-2021-03-30";
+
+  src = fetchFromGitHub {
+    owner = "blynn";
+    repo = pname;
+    rev = "1a3320dab988372f8910ccc838a6a7a45c8980ff";
+    hash = "sha256-DtJkV380T2B5j0+u7lYZfbC0ej0udF4GW2lbRmmbjAM=";
+  };
+
+  goPackagePath = "github.com/blynn/nex";
+  subPackages = [ "." ];
+
+  meta = with lib; {
+    description = "Lexer for Go";
+    homepage = "https://github.com/blynn/nex";
+    license = licenses.gpl3Only;
+    maintainers = with maintainers; [ urandom ];
+  };
+}
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 29973ea019f557b..9f31cacdcafeaee 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -17661,6 +17661,8 @@ with pkgs;
 
   nap = callPackage ../development/tools/nap { };
 
+  nex = callPackage ../development/tools/parsing/nex {};
+
   nil = callPackage ../development/tools/nil { };
 
   ninja = callPackage ../development/tools/build-managers/ninja { };