openvino: fix install layout with OV_CPACK_* variables

pkgs/by-name/op/openvino/package.nix

@@ -34,6 +34,7 @@
 let
   inherit (lib)
     cmakeBool
+    cmakeFeature
     getLib
     ;
 
@@ -98,6 +99,19 @@ stdenv.mkDerivation (finalAttrs: {
     "-DProtobuf_LIBRARIES=${getLib protobuf}/lib/libprotobuf${stdenv.hostPlatform.extensions.sharedLibrary}"
     "-DPython_EXECUTABLE=${python.interpreter}"
 
+    # OV_CPACK_* variables are normally set by packaging macros that only run
+    # when CPACK_GENERATOR matches a known type to upstream.
+    # Without one, all vars remain undefined and install() destinations are empty,
+    # putting files in $out/ root or producing absolute paths. Set them directly
+    # here so the build produces a standard layout.
+    (cmakeFeature "OV_CPACK_LIBRARYDIR" "lib")
+    (cmakeFeature "OV_CPACK_RUNTIMEDIR" "lib")
+    (cmakeFeature "OV_CPACK_ARCHIVEDIR" "lib")
+    (cmakeFeature "OV_CPACK_INCLUDEDIR" "include")
+    (cmakeFeature "OV_CPACK_OPENVINO_CMAKEDIR" "lib/cmake/OpenVINO")
+    (cmakeFeature "OV_CPACK_PYTHONDIR" "python")
+    (cmakeFeature "OV_CPACK_PLUGINSDIR" "lib")
+
     (cmakeBool "CMAKE_VERBOSE_MAKEFILE" true)
     (cmakeBool "NCC_SYLE" false)
     (cmakeBool "BUILD_TESTING" false)