Update BUILDING.md: mention required patch utility

dCache · May 15, 2023 · 5a90236 · 5a90236
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diff --git a/BUILDING.md b/BUILDING.md
@@ -110,6 +110,7 @@ thus to run without postgresql. To build it simply run:
 
     mvn clean package -am -pl packages/system-test
 
+You will need the `patch` utility for it to succeed.
 This entails a completely self-contained dCache instance in
 `packages/system-test/target/dcache`. It can be started using: