leezu commented on a change in pull request #17297: Fix NCCL Cmake autodetect 
issue
URL: https://github.com/apache/incubator-mxnet/pull/17297#discussion_r366391503
 
 

 ##########
 File path: cmake/Modules/FindNCCL.cmake
 ##########
 @@ -33,6 +33,26 @@
 
 set(NCCL_ROOT_DIR "" CACHE PATH "Folder contains NVIDIA NCCL")
 
+# if CUDAToolkit_FOUND is not found, try default location
+#if (NOT CUDAToolkit_FOUND)
+  if (UNIX)
+    set (search_paths "/usr/local/cuda")
+
+    find_path(NCCL_INCLUDE_DIRS
+    NAMES nccl.h
+    PATHS ${search_paths}
 
 Review comment:
   When writing the comment I thought PATHS may skip default locations whereas 
HINTS would be defaults + specified locations. Thanks for pointing out they are 
equivalent.

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