diff --git a/pkgs/development/lisp-modules/packages.nix b/pkgs/development/lisp-modules/packages.nix
index fdb4e0995aee..a2f8a20d3c01 100644
--- a/pkgs/development/lisp-modules/packages.nix
+++ b/pkgs/development/lisp-modules/packages.nix
@@ -591,6 +591,23 @@ let
     lispLibs = with super; [ clim mcclim mcclim-layouts ];
   };
 
+  kons-9 = build-asdf-system rec {
+    pname = "kons-9";
+    version = "trunk";
+    src = pkgs.fetchFromGitHub {
+      owner = "kaveh808";
+      repo = "kons-9";
+      rev = "95ad44fac0566f445c4b7bd040339dcff75ee992";
+      sha256 = "19rl7372j9f1cv2kl55r8vyf4dhcz4way4hkjgysbxzrb1psp17n";
+    };
+    systems = [ "kons-9" "kons-9/testsuite" ];
+    lispLibs = with super; [
+      closer-mop trivial-main-thread trivial-backtrace cffi cl-opengl cl-glu
+      cl-glfw3 cl-paths-ttf zpb-ttf cl-vectors origin clobber
+      org_dot_melusina_dot_confidence
+    ];
+  };
+
   });
 
 in packages