From c863ee6754c7907a5bf8a55256985cd1b464c1da Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?S=C3=A9bastien=20Loriot?= <sebastien.loriot@cgal.org>
Date: Tue, 4 May 2021 17:28:52 +0200
Subject: [PATCH] fix check_headers compilation issues

---
 Classification/include/CGAL/Classification/Label.h              | 1 +
 .../include/CGAL/Mesh_3/Mesh_complex_3_in_triangulation_3_fwd.h | 2 ++
 2 files changed, 3 insertions(+)

diff --git a/Classification/include/CGAL/Classification/Label.h b/Classification/include/CGAL/Classification/Label.h
index 7b9e5b2a72f..7801942afcb 100644
--- a/Classification/include/CGAL/Classification/Label.h
+++ b/Classification/include/CGAL/Classification/Label.h
@@ -15,6 +15,7 @@
 #include <CGAL/license/Classification.h>
 #include <CGAL/IO/Color.h>
 
+#include <string>
 #include <memory>
 
 namespace CGAL {
diff --git a/Installation/include/CGAL/Mesh_3/Mesh_complex_3_in_triangulation_3_fwd.h b/Installation/include/CGAL/Mesh_3/Mesh_complex_3_in_triangulation_3_fwd.h
index d0202553abc..6d644faa1ec 100644
--- a/Installation/include/CGAL/Mesh_3/Mesh_complex_3_in_triangulation_3_fwd.h
+++ b/Installation/include/CGAL/Mesh_3/Mesh_complex_3_in_triangulation_3_fwd.h
@@ -13,6 +13,8 @@
 /// \file Mesh_complex_3_in_triangulation_3_fwd.h
 /// Forward declarations of the Mesh_3 package.
 
+#include <istream>
+
 #ifndef DOXYGEN_RUNNING
 namespace CGAL {