diff --git a/pkgs/development/interpreters/ngn-k/default.nix b/pkgs/development/interpreters/ngn-k/default.nix
index e70ac2992146..dfd6b17f65fa 100644
--- a/pkgs/development/interpreters/ngn-k/default.nix
+++ b/pkgs/development/interpreters/ngn-k/default.nix
@@ -13,14 +13,14 @@ in
 
 useStdenv.mkDerivation {
   pname = "ngn-k";
-  version = "unstable-2021-08-30";
+  version = "unstable-2021-12-17";
 
   src = fetchFromGitea {
     domain = "codeberg.org";
     owner = "ngn";
     repo = "k";
-    rev = "3e2bcb81c723e268015818570f2805547114b5dd";
-    sha256 = "0b16971xgf0sgx7qf41dilrpz02jnas61gfwkyvbxv18874w5vap";
+    rev = "26f83645e9ed4798b43390fb9dcdfa0ab8245a8f";
+    sha256 = "sha256-VcJcLcL1C8yQH6xvpKR0R0gMrhSfsU4tW+Yy0rGdSSw=";
   };
 
   patches = [
@@ -28,8 +28,7 @@ useStdenv.mkDerivation {
   ];
 
   postPatch = ''
-    # make self-reference for LICENSE
-    substituteAllInPlace repl.k
+    patchShebangs a19/a.sh a20/a.sh a21/a.sh dy/a.sh e/a.sh
 
     # don't use hardcoded /bin/sh
     for f in repl.k m.c;do
@@ -38,14 +37,18 @@ useStdenv.mkDerivation {
   '';
 
   makeFlags = [ "-e" ];
-  buildFlags = [ "k" ];
+  buildFlags = [ "k" "libk.so" ];
   checkTarget = "t";
   inherit doCheck;
 
+  outputs = [ "out" "dev" "lib" ];
+
   installPhase = ''
     runHook preInstall
     install -Dm755 k "$out/bin/k"
     install -Dm755 repl.k "$out/bin/k-repl"
+    install -Dm755 libk.so "$lib/lib/libk.so"
+    install -Dm644 k.h "$dev/include/k.h"
     install -Dm644 LICENSE -t "$out/share/ngn-k"
     substituteInPlace "$out/bin/k-repl" --replace "#!k" "#!$out/bin/k"
     runHook postInstall
diff --git a/pkgs/development/interpreters/ngn-k/repl-license-path.patch b/pkgs/development/interpreters/ngn-k/repl-license-path.patch
index 1b0ce708f0c3..6b5d1e4fb6ae 100644
--- a/pkgs/development/interpreters/ngn-k/repl-license-path.patch
+++ b/pkgs/development/interpreters/ngn-k/repl-license-path.patch
@@ -1,14 +1,10 @@
-diff --git a/repl.k b/repl.k
-index e4071e6..70ae276 100755
 --- a/repl.k
 +++ b/repl.k
-@@ -3,8 +3,7 @@ repl.banner:"ngn/k, (c) 2019-2021 ngn, GNU AGPLv3. type \\ for more info\n"
- repl.prompt:," "
- repl.cmds:""!()
- repl.cmds["vf"]:{` 0:($!h),'":",'`k'. h:(&(x~"v")=^`o`p`q`r`u`v`w?@'h)#h:``repl_.:0#`}
--repl.cmds["a"]:{` 1:1:repl.basename[`argv 0],"/LICENSE";}
--repl.basename:{$[#x:"/"/-1_"/"\x;x;,"."]}
-+repl.cmds["a"]:{` 1:1:"@out@/share/ngn-k/LICENSE";}
+@@ -1,6 +1,6 @@
+ #!k
+ `1:"ngn/k, (c) 2019-2021 ngn, GNU AGPLv3. type \\ for more info\n",repl.prompt:," "
+-repl.cmds:(,"a")!{`1:1:repl.joinpath[repl.dirname`argv 0]"LICENSE";}
++repl.cmds:(,"a")!{`1:1:repl.joinpath[repl.dirname`argv 0]"../share/ngn-k/LICENSE";}
+ repl.dirname:{$[#x:"/"/-1_"/"\x;x;,"."]}
+ repl.joinpath:{$[x~,".";y;"/"~*|x;x,y;x,"/",y]}
  repl.fmt:{$[x~(::);"";(`A~@x)&1<#x;"(",("\n "/`k'x),")\n";`k[x],"\n"]}
- repl.line:{$[#x;;:0];x:-1_x;$[(3>#x)&("\\"=*x)&~^(!repl.cmds)?x 1;repl.cmds[x 1]x 1;.[` 1:repl.fmt@.:;,x;`epr@]];` 1:repl.prompt;1}
- {repl.cmds[x[1]1]:{y;` 0:x}2_x}'{(&x~\:80#"-")_x:(1+*&x~\:,"/")_-1_x}@0:`argv 1;