From 84efa0aa1709c6296a43bba98917c468954160d2 Mon Sep 17 00:00:00 2001
From: Thomas Madlener <thomas.madlener@desy.de>
Date: Thu, 30 Oct 2025 10:22:09 +0100
Subject: [PATCH] Make building against ROOT 6.38 possible

---
 src/geometry.cc | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/src/geometry.cc b/src/geometry.cc
index 15ff4e15..5f6ab9e5 100644
--- a/src/geometry.cc
+++ b/src/geometry.cc
@@ -20,7 +20,6 @@
 
 #include "Minuit2/FCNAdapter.h"
 #include "Minuit2/FumiliFCNAdapter.h"
-#include "Minuit2/FCNGradAdapter.h"
 #include "Minuit2/FunctionMinimum.h"
 #include "Minuit2/MnMigrad.h"
 #include "Minuit2/MnMinos.h"
@@ -1324,7 +1323,7 @@ double GeometryHandler::PointFit(const vector<PointBase*>& points, const TVector
   param.Add("x",initial.x(),1e-4);
   param.Add("y",initial.y(),1e-4);
   param.Add("z",initial.z(),1e-4);
-  ROOT::Minuit2::FCNAdapter<ROOT::Math::IMultiGenFunction> func(f, 1. ); // errordef = 1 in chi2 minimization
+  ROOT::Minuit2::FCNAdapter func(f, 1. ); // errordef = 1 in chi2 minimization
 
   int maxfcn = 10000; // max function calls
   double tol = 0.01; // tolerance