diff --git a/Kinetic_space_partition/include/CGAL/KSP/debug.h b/Kinetic_space_partition/include/CGAL/KSP/debug.h
index 6177e94f929..2b750a0231a 100644
--- a/Kinetic_space_partition/include/CGAL/KSP/debug.h
+++ b/Kinetic_space_partition/include/CGAL/KSP/debug.h
@@ -40,7 +40,7 @@ namespace CGAL {
 namespace KSP_3 {
 namespace internal {
 
-const std::tuple<unsigned char, unsigned char, unsigned char>
+inline const std::tuple<unsigned char, unsigned char, unsigned char>
 get_idx_color(std::size_t idx) {
 
   CGAL::Random rand(static_cast<unsigned int>(idx));
@@ -50,7 +50,7 @@ get_idx_color(std::size_t idx) {
     static_cast<unsigned char>(rand.get_int(32, 192)));
 }
 
-CGAL::IO::Color get_color(std::size_t idx) {
+inline CGAL::IO::Color get_color(std::size_t idx) {
   CGAL::Random rand(static_cast<unsigned int>(idx));
   return CGAL::IO::Color(rand.get_int(32, 192), rand.get_int(32, 192), rand.get_int(32, 192));
 }
@@ -929,7 +929,7 @@ void dump_polygon(const std::vector<typename K::Point_3>& pts, const std::string
   saver.export_polygon_soup_3(pts2, filename);
 }
 
-void dump_polygon(const std::vector<CGAL::Epick::Point_3>& pts, const std::string& filename) {
+inline void dump_polygon(const std::vector<CGAL::Epick::Point_3>& pts, const std::string& filename) {
   Saver<CGAL::Epick> saver;
   std::vector<std::vector<CGAL::Epick::Point_3> > pts2;
   pts2.push_back(pts);
@@ -937,7 +937,7 @@ void dump_polygon(const std::vector<CGAL::Epick::Point_3>& pts, const std::strin
   saver.export_polygon_soup_3(pts2, filename);
 }
 
-void dump_polygona(const std::vector<CGAL::Epick::Point_3>& pts, const std::string& filename) {
+inline void dump_polygona(const std::vector<CGAL::Epick::Point_3>& pts, const std::string& filename) {
   Saver<CGAL::Epick> saver;
   std::vector<std::vector<CGAL::Epick::Point_3> > pts2;
   pts2.push_back(pts);
@@ -945,30 +945,31 @@ void dump_polygona(const std::vector<CGAL::Epick::Point_3>& pts, const std::stri
   saver.export_polygon_soup_3(pts2, filename);
 }
 
-void dump_polygons(const std::vector<std::vector<CGAL::Epick::Point_3> >& pts, const std::string& filename) {
-  Saver<CGAL::Epick> saver;
-
-  saver.export_polygon_soup_3(pts, filename);
-}
-void dump_polygons(const std::vector<std::vector<std::vector<CGAL::Epick::Point_3> > >& pts, const std::string& filename) {
+inline void dump_polygons(const std::vector<std::vector<CGAL::Epick::Point_3> >& pts, const std::string& filename) {
   Saver<CGAL::Epick> saver;
 
   saver.export_polygon_soup_3(pts, filename);
 }
 
-void dump_indexed_triangles(const std::vector<CGAL::Epick::Point_3>& pts, const std::vector<std::size_t>& tris, const std::string& filename) {
+inline void dump_polygons(const std::vector<std::vector<std::vector<CGAL::Epick::Point_3> > >& pts, const std::string& filename) {
+  Saver<CGAL::Epick> saver;
+
+  saver.export_polygon_soup_3(pts, filename);
+}
+
+inline void dump_indexed_triangles(const std::vector<CGAL::Epick::Point_3>& pts, const std::vector<std::size_t>& tris, const std::string& filename) {
   Saver<CGAL::Epick> saver;
 
   saver.export_indexed_triangles_3(pts, tris, filename);
 }
 
-void dump_indexed_polygons(const std::vector<CGAL::Epick::Point_3>& pts, const std::vector<std::vector<std::size_t> >& polys, const std::string& filename) {
+inline void dump_indexed_polygons(const std::vector<CGAL::Epick::Point_3>& pts, const std::vector<std::vector<std::size_t> >& polys, const std::string& filename) {
   Saver<CGAL::Epick> saver;
 
   saver.export_indexed_polygons_3(pts, polys, filename);
 }
 
-  void dump_polygons(const std::vector<std::vector<CGAL::Epick::Point_3> >& pts, const std::vector<CGAL::IO::Color>& colors, const std::string& filename) {
+inline void dump_polygons(const std::vector<std::vector<CGAL::Epick::Point_3> >& pts, const std::vector<CGAL::IO::Color>& colors, const std::string& filename) {
   Saver<CGAL::Epick> saver;
 
   saver.export_polygon_soup_3(pts, colors, filename);
@@ -1013,7 +1014,7 @@ void dump_polygons(
   saver.export_polygon_soup_3(polygons, name);
 }
 
-void dump_points(const std::vector<CGAL::Epick::Point_3>& pts, const std::vector<CGAL::Epick::Vector_3>& normals, const std::vector<CGAL::IO::Color>& colors, const std::string& filename) {
+inline void dump_points(const std::vector<CGAL::Epick::Point_3>& pts, const std::vector<CGAL::Epick::Vector_3>& normals, const std::vector<CGAL::IO::Color>& colors, const std::string& filename) {
   Saver<CGAL::Epick> saver;
   saver.export_points_3(pts, normals, colors, filename);
 }