add some build help in the readme (#141)

Alpine-DAV · Oct 30, 2019 · 29ce03e · 29ce03e
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commit 29ce03e
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diff --git a/README.md b/README.md
@@ -11,6 +11,9 @@ For the current version see:
 
 https://github.com/Alpine-DAV/vtk-h/blob/develop/hashes.txt
 
+Additionally, VTK-m has several build settings and we test with a specific combination.
+When building VTK-m, be sure to set `VTKm_USE_64BIT_IDS=OFF` and `VTKm_USE_DOUBLE_PRECISION=ON`.
+
 Source Repo
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