1 files changed, 7 insertions, 1 deletions
diff --git a/pkgs/development/python-modules/kaldi-active-grammar/default.nix b/pkgs/development/python-modules/kaldi-active-grammar/default.nix
index 46fc619b4cb..a1ef7e31465 100644
--- a/pkgs/development/python-modules/kaldi-active-grammar/default.nix
+++ b/pkgs/development/python-modules/kaldi-active-grammar/default.nix
@@ -5,6 +5,7 @@
 , cmake
 , ush
 , requests
+, six
 , numpy
 , cffi
 , openfst
@@ -12,6 +13,11 @@
 , callPackage
 }:
 
+#
+# Maintainer note: only in-tree dependant is `dragonfly`, try to
+# update the two alongside eachother.
+#
+
 let
   kaldi = callPackage ./fork.nix { };
 in
@@ -48,7 +54,7 @@ buildPythonPackage rec {
 
   buildInputs = [ openfst kaldi ];
   nativeBuildInputs = [ scikit-build cmake ];
-  propagatedBuildInputs = [ ush requests numpy cffi ];
+  propagatedBuildInputs = [ ush requests numpy cffi six ];
 
   doCheck = false;  # no tests exist