python3Packages.pytorch: Fix CMake files for split outputs

Fixes #102146

pkgs/development/python-modules/pytorch/default.nix

@@ -254,6 +254,15 @@ in buildPythonPackage rec {
     cp -r $out/${python.sitePackages}/torch/include $dev/include
     cp -r $out/${python.sitePackages}/torch/share   $dev/share
 
+    # Fix up library paths for split outputs
+    substituteInPlace \
+      $dev/share/cmake/Torch/TorchConfig.cmake \
+      --replace \''${TORCH_INSTALL_PREFIX}/lib "$lib/lib"
+
+    substituteInPlace \
+      $dev/share/cmake/Caffe2/Caffe2Targets-release.cmake \
+      --replace \''${_IMPORT_PREFIX}/lib "$lib/lib"
+
     mkdir $lib
     cp -r $out/${python.sitePackages}/torch/lib     $lib/lib
   '';