Update install.md

Adding a note to address @coot 's comment (#2713 (comment))
IntersectMBO · May 31, 2021 · 53c984f · 53c984f
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commit 53c984f
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diff --git a/doc/getting-started/install.md b/doc/getting-started/install.md
@@ -141,6 +141,11 @@ We explicitly use the GHC version that we installed earlier.  This avoids defaul
 
     cabal configure --with-compiler=ghc-8.10.4
 
+Note, that for a development build you can update the local project file to use the VRF library that you installed earlier:
+
+    echo "package cardano-crypto-praos" >>  cabal.project.local
+    echo "  flags: -external-libsodium-vrf" >>  cabal.project.local
+
 #### Building and installing the node
 
 Build the node and CLI with `cabal`: