1 files changed, 5 insertions, 0 deletions
diff --git a/src/main/java/com/google/devtools/build/lib/analysis/ConfigurationMakeVariableContext.java b/src/main/java/com/google/devtools/build/lib/analysis/ConfigurationMakeVariableContext.java
index a5c7cbfb99..f9c170a0e2 100644
--- a/src/main/java/com/google/devtools/build/lib/analysis/ConfigurationMakeVariableContext.java
+++ b/src/main/java/com/google/devtools/build/lib/analysis/ConfigurationMakeVariableContext.java
@@ -105,4 +105,9 @@ public class ConfigurationMakeVariableContext implements TemplateContext {
     }
     return SkylarkDict.<String, String>copyOf(null, map);
   }
+
+  @Override
+  public String lookupFunction(String name, String param) throws ExpansionException {
+    throw new ExpansionException(String.format("$(%s) not defined", name));
+  }
 }