From e59a2e909ec3b3056a640cec4bce67b91240c322 Mon Sep 17 00:00:00 2001
From: Sizhe Zhao <prc.zhao@outlook.com>
Date: Mon, 9 Jun 2025 04:42:56 +0800
Subject: [PATCH] root5: fix building with python 3.13 (#414801)

---
 pkgs/by-name/ro/root5/package.nix                  |  4 ++++
 .../ro/root5/python313-PyCFunction_Call.patch      | 14 ++++++++++++++
 2 files changed, 18 insertions(+)
 create mode 100644 pkgs/by-name/ro/root5/python313-PyCFunction_Call.patch

diff --git a/pkgs/by-name/ro/root5/package.nix b/pkgs/by-name/ro/root5/package.nix
index 760eda7bb7e8..abffe178a93f 100644
--- a/pkgs/by-name/ro/root5/package.nix
+++ b/pkgs/by-name/ro/root5/package.nix
@@ -85,6 +85,10 @@ stdenv.mkDerivation rec {
     # Backport Python 3.11 fix to v5 from v6.26
     # https://github.com/root-project/root/commit/484deb056dacf768aba4954073b41105c431bffc
     ./root5-python311-fix.patch
+
+    # Backport Python 3.13 fix to v5 from v6.25
+    # https://github.com/root-project/root/commit/9aa67a863482eef8cf50850b9ac3724e35f58781
+    ./python313-PyCFunction_Call.patch
   ];
 
   # https://github.com/root-project/root/issues/13216
diff --git a/pkgs/by-name/ro/root5/python313-PyCFunction_Call.patch b/pkgs/by-name/ro/root5/python313-PyCFunction_Call.patch
new file mode 100644
index 000000000000..a447b4760d0d
--- /dev/null
+++ b/pkgs/by-name/ro/root5/python313-PyCFunction_Call.patch
@@ -0,0 +1,14 @@
+--- a/bindings/pyroot/src/TCustomPyTypes.cxx
++++ b/bindings/pyroot/src/TCustomPyTypes.cxx
+@@ -240,7 +240,11 @@
+ // the function is globally shared, so set and reset its "self" (ok, b/c of GIL)
+    Py_INCREF( self );
+    func->m_self = self;
++#if PY_VERSION_HEX >= 0x03090000
++   PyObject* result = PyObject_Call( (PyObject*)func, args, kw );
++#else
+    PyObject* result = PyCFunction_Call( (PyObject*)func, args, kw );
++#endif
+    func->m_self = 0;
+    Py_DECREF( self );
+    Py_DECREF( args );