From d29036df2b065a71930132bdeb43215b0a826c0f Mon Sep 17 00:00:00 2001
From: Marvin Wright <github@wrig.de>
Date: Thu, 15 Jan 2026 15:56:38 +0100
Subject: [PATCH 1/3] temporarily enforce cpp20 for testing CRAN issue

---
 src/Makevars     | 3 ++-
 src/Makevars.win | 3 ++-
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/Makevars b/src/Makevars
index a77f2396..016e9d51 100644
--- a/src/Makevars
+++ b/src/Makevars
@@ -1,2 +1,3 @@
 PKG_CPPFLAGS = -DR_BUILD
-
+CXX_STD = CXX20
+PKG_CXXFLAGS = -std=c++20
diff --git a/src/Makevars.win b/src/Makevars.win
index a6af4dd1..6532fc1c 100644
--- a/src/Makevars.win
+++ b/src/Makevars.win
@@ -1,2 +1,3 @@
 PKG_CPPFLAGS = -DR_BUILD -DWIN_R_BUILD
-
+CXX_STD = CXX20
+PKG_CXXFLAGS = -std=c++20

From dfd392803d8098b4a5aa921b15abd6c2a1cf2743 Mon Sep 17 00:00:00 2001
From: Marvin Wright <github@wrig.de>
Date: Thu, 15 Jan 2026 16:03:12 +0100
Subject: [PATCH 2/3] fix cpp20 compilation

---
 src/utility.h | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/src/utility.h b/src/utility.h
index 7d9a57cd..eb1aa7f4 100644
--- a/src/utility.h
+++ b/src/utility.h
@@ -12,6 +12,10 @@
 #ifndef UTILITY_H_
 #define UTILITY_H_
 
+#ifdef R_BUILD
+#include <Rcpp.h>
+#endif
+
 #include <math.h>
 #include <vector>
 #include <iostream>
@@ -25,10 +29,6 @@
 #include <type_traits> 
 #include <utility> 
 
-#ifdef R_BUILD
-#include <Rinternals.h>
-#endif
-
 #include "globals.h"
 #include "Data.h"
 

From 57ec65149577185a44ffa29d0484c0c79aec34e4 Mon Sep 17 00:00:00 2001
From: Marvin Wright <github@wrig.de>
Date: Thu, 15 Jan 2026 16:03:35 +0100
Subject: [PATCH 3/3] new version for cpp20 fix

---
 DESCRIPTION               | 6 +++---
 NEWS.md                   | 3 +++
 cpp_version/src/version.h | 2 +-
 3 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/DESCRIPTION b/DESCRIPTION
index 64acc597..1809564b 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -1,8 +1,8 @@
 Package: ranger
 Type: Package
 Title: A Fast Implementation of Random Forests
-Version: 0.17.1
-Date: 2025-06-04
+Version: 0.17.2
+Date: 2026-01-15
 Authors@R: c(
     person("Marvin N.", "Wright", email = "cran@wrig.de", role = c("aut", "cre")),
     person("Stefan", "Wager", role = "ctb"),
@@ -21,7 +21,7 @@ Suggests:
     survival,
     testthat
 Encoding: UTF-8
-RoxygenNote: 7.3.2
+RoxygenNote: 7.3.3
 URL: https://imbs-hl.github.io/ranger/,
     https://github.com/imbs-hl/ranger
 BugReports: https://github.com/imbs-hl/ranger/issues
diff --git a/NEWS.md b/NEWS.md
index 0f2f6cc1..99581931 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -1,4 +1,7 @@
 
+# ranger 0.17.2
+* Fix compilation with C++20
+
 # ranger 0.17.1
 * Fix bug where missing value handling lead to negative impurity importance values
 * Slightly change the missing value algorithm (see docs)
diff --git a/cpp_version/src/version.h b/cpp_version/src/version.h
index 7e2f9192..eedd6caf 100644
--- a/cpp_version/src/version.h
+++ b/cpp_version/src/version.h
@@ -1,3 +1,3 @@
 #ifndef RANGER_VERSION
-#define RANGER_VERSION "0.17.1"
+#define RANGER_VERSION "0.17.2"
 #endif