From b51ea4b2161644c4da12cb91c20ea843de2dd407 Mon Sep 17 00:00:00 2001
From: Lars Bilke <lars.bilke@ufz.de>
Date: Thu, 2 Jan 2025 11:14:56 +0100
Subject: [PATCH] Fix TCLAP::SpecificationException with tclap 1.4.

-a <NAME>,  --first_data_array <NAME> -- Required arguments are not allowed in an exclusive grouping.
---
 vtkdiff.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/vtkdiff.cpp b/vtkdiff.cpp
index d6568fb..c7782f8 100644
--- a/vtkdiff.cpp
+++ b/vtkdiff.cpp
@@ -110,7 +110,7 @@ auto parseCommandLine(int argc, char* argv[]) -> Args
     cmd.add(vtk_input_b_arg);
 
     TCLAP::ValueArg<std::string> data_array_a_arg(
-        "a", "first_data_array", "First data array name for comparison", true,
+        "a", "first_data_array", "First data array name for comparison", false,
         "", "NAME");
 
     TCLAP::ValueArg<std::string> data_array_b_arg(