Update INSTALL.md

rime · Feb 21, 2018 · 66787f0 · 66787f0
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commit 66787f0
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diff --git a/INSTALL.md b/INSTALL.md
@@ -29,6 +29,11 @@ Make sure `BOOST_ROOT` is set to `X:\path\to\boost_N_NN_N` in `weasel.props`.
 Forget about Python. It's not used anyway.
 
 Then, start a Developer Command Prompt window.
+Set `BOOST_ROOT` environmental variable:
+
+```batch
+set BOOST_ROOT=X:\path\to\boost_N_NN_N
+```
 
 ### Build