odhcp6c: fix build and update to latest tip (#478893)

pkgs/by-name/od/odhcp6c/package.nix

@@ -3,23 +3,25 @@
   stdenv,
   fetchgit,
   cmake,
+  libubox,
   unstableGitUpdater,
 }:
 
 stdenv.mkDerivation {
   pname = "odhcp6c";
-  version = "0-unstable-2025-10-21";
+  version = "0-unstable-2025-12-29";
 
   src = fetchgit {
     url = "https://git.openwrt.org/project/odhcp6c.git";
-    rev = "77e1ae21e67f81840024ffe5bb7cf69a8fb0d2f0";
-    hash = "sha256-aOW0rOGd4YwnfXjsUj6HHy8zf0FJYFjsKMWJ5yhUl5g=";
+    rev = "8abb45065f5ef9d176efa6bd151a1209b05852c4";
+    hash = "sha256-xly6FAp8yddBnJeCSupVIq0Wec+sSFuuKH91MNKvHwM=";
   };
 
   nativeBuildInputs = [ cmake ];
+  buildInputs = [ libubox ];
 
   cmakeFlags = [
-    "-DCMAKE_INSTALL_PREFIX=$out"
+    "-DCMAKE_INSTALL_PREFIX=${placeholder "out"}"
   ];
 
   passthru.updateScript = unstableGitUpdater { };