Libraries (such as 'libtorch_cpu.so') and executables (such as 'torch_shm_manager')
get installed, quite surprisingly, to 'lib/python3.8/site-packages/{bin,lib}'.
Make sure RUNPATH matches that.

diff --git a/cmake/Dependencies.cmake b/cmake/Dependencies.cmake
index f1f2eb7..cb5caea 100644
--- a/cmake/Dependencies.cmake
+++ b/cmake/Dependencies.cmake
@@ -4,7 +4,7 @@ if(APPLE)
   set(CMAKE_MACOSX_RPATH ON)
   set(_rpath_portable_origin "@loader_path")
 else()
-  set(_rpath_portable_origin $ORIGIN)
+  set(_rpath_portable_origin $ORIGIN/../lib)
 endif(APPLE)
 # Use separate rpaths during build and install phases
 set(CMAKE_SKIP_BUILD_RPATH  FALSE)
diff --git a/functorch/CMakeLists.txt b/functorch/CMakeLists.txt
index bdfa4bf..2a75e38 100644
--- a/functorch/CMakeLists.txt
+++ b/functorch/CMakeLists.txt
@@ -26,7 +26,7 @@ target_link_libraries(${PROJECT_NAME} PRIVATE pybind::pybind11)
 
 set_target_properties(${PROJECT_NAME} PROPERTIES LIBRARY_OUTPUT_DIRECTORY
       ${CMAKE_BINARY_DIR}/functorch)
-set_target_properties(${PROJECT_NAME} PROPERTIES INSTALL_RPATH "${_rpath_portable_origin}/../torch/lib")
+set_target_properties(${PROJECT_NAME} PROPERTIES INSTALL_RPATH "$ORIGIN/../torch/lib")
 
 # Copy-pasted prefix/suffix logic for Python extensions from
 # https://github.com/pytorch/pytorch/blob/33bb8ae350611760139457b85842b1d7edf9aa11/caffe2/CMakeLists.txt#L1975
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