nealrichardson commented on code in PR #43504:
URL: https://github.com/apache/arrow/pull/43504#discussion_r1700271857
##########
r/src/arrow_cpp11.h:
##########
@@ -389,7 +389,7 @@ SEXP to_r6(const std::shared_ptr<T>& ptr, const char*
r6_class_name) {
// R_existsVarInFrame doesn't exist before R 4.2, so we need to fall back to
// Rf_findVarInFrame3 if it is not defined.
-#ifdef R_existsVarInFrame
+#if (R_VERSION >= R_Version(4, 2, 0))
Review Comment:
Based on what I see elsewhere we don't need the parens
```suggestion
#if R_VERSION >= R_Version(4, 2, 0)
```
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