Handle when CMAKE_INSTALL_LIBDIR has nested directories

cmake/CubInstallRules.cmake

@@ -22,8 +22,9 @@ install(DIRECTORY "${CUB_SOURCE_DIR}/cub/cmake/"
 )
 # Need to configure a file to store the infix specified in
 # CMAKE_INSTALL_INCLUDEDIR since it can be defined by the user
+set(install_location "${CMAKE_INSTALL_LIBDIR}/cmake/cub")
 configure_file("${CUB_SOURCE_DIR}/cub/cmake/cub-header-search.cmake.in"
   "${CUB_BINARY_DIR}/cub/cmake/cub-header-search.cmake"
   @ONLY)
 install(FILES "${CUB_BINARY_DIR}/cub/cmake/cub-header-search.cmake"
-  DESTINATION "${CMAKE_INSTALL_LIBDIR}/cmake/cub")
+  DESTINATION "${install_location}")

cub/cmake/cub-header-search.cmake.in

@@ -1,8 +1,18 @@
 # Parse version information from version.h:
 unset(_CUB_VERSION_INCLUDE_DIR CACHE) # Clear old result to force search
+
+# Find CMAKE_INSTALL_INCLUDEDIR=@CMAKE_INSTALL_INCLUDEDIR@ directory"
+set(from_install_prefix "@install_location@")
+
+# Transform to a list of directories, replace each directoy with "../"
+# and convert back to a string
+string(REGEX REPLACE "/" ";" from_install_prefix "${from_install_prefix}")
+list(TRANSFORM from_install_prefix REPLACE ".+" "../")
+list(JOIN from_install_prefix "" from_install_prefix)
+
 find_path(_CUB_VERSION_INCLUDE_DIR cub/version.cuh
   NO_DEFAULT_PATH # Only search explicit paths below:
   PATHS
-    "${CMAKE_CURRENT_LIST_DIR}/../../../@CMAKE_INSTALL_INCLUDEDIR@" # Install tree
+    "${CMAKE_CURRENT_LIST_DIR}/${from_install_prefix}/@CMAKE_INSTALL_INCLUDEDIR@"
 )
 set_property(CACHE _CUB_VERSION_INCLUDE_DIR PROPERTY TYPE INTERNAL)