Update README.md

Co-authored-by: Saleem Abdulrasool <compnerd@compnerd.org>
diff --git a/README.md b/README.md
index 64f792e..a83d4c7 100644
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@@ -65,8 +65,9 @@
 To build, use `cmake`. For example:
 
 ```
-$ cmake -G Ninja .
-$ ninja
+$ cmake -B build -G Ninja -S .
+$ cmake --build build
+$ cmake --build build --target install
 ```
 
 Bloaty bundles ``libprotobuf``, ``re2``, ``capstone``, and