https://github.com/prusa3d/PrusaSlicer/pull/13081#issuecomment-2384156635

--- a/tests/libslic3r/test_emboss.cpp
+++ b/tests/libslic3r/test_emboss.cpp
@@ -9,8 +9,16 @@
 #include <libslic3r/IntersectionPoints.hpp>
 using namespace Slic3r;
 
+template <typename T>
+auto access_pmap(std::optional<T> opt) -> T {
+    return opt.value();
+}
+
+template <typename Pair>
+auto access_pmap(Pair pair) { return pair.first; }
+
 namespace Private{
-        
+
 // calculate multiplication of ray dir to intersect - inspired by
 // segment_segment_intersection when ray dir is normalized retur distance from
 // ray point to intersection No value mean no intersection
@@ -904,8 +912,8 @@
     // identify glyph for intersected vertex
     std::string vert_shape_map_name = "v:glyph_id";
     MyMesh cgal_object = MeshBoolean::cgal2::to_cgal(cube, face_map_name);
-    auto face_map = cgal_object.property_map<MyMesh::Face_index, int32_t>(face_map_name).first;
-    auto vert_shape_map = cgal_object.add_property_map<MyMesh::Vertex_index, IntersectingElemnt>(vert_shape_map_name).first;
+    auto face_map = access_pmap(cgal_object.property_map<MyMesh::Face_index, int32_t>(face_map_name));
+    auto vert_shape_map = access_pmap(cgal_object.add_property_map<MyMesh::Vertex_index, IntersectingElemnt>(vert_shape_map_name));
 
     std::string edge_shape_map_name = "e:glyph_id";
     std::string face_shape_map_name = "f:glyph_id";
@@ -913,8 +921,8 @@
 
     MyMesh cgal_shape = MeshBoolean::cgal2::to_cgal(shape, projection, 0, edge_shape_map_name, face_shape_map_name, glyph_contours);    
 
-    auto edge_shape_map = cgal_shape.property_map<MyMesh::Edge_index, IntersectingElemnt>(edge_shape_map_name).first;
-    auto face_shape_map = cgal_shape.property_map<MyMesh::Face_index, IntersectingElemnt>(face_shape_map_name).first;
+    auto edge_shape_map = access_pmap(cgal_shape.property_map<MyMesh::Edge_index, IntersectingElemnt>(edge_shape_map_name));
+    auto face_shape_map = access_pmap(cgal_shape.property_map<MyMesh::Face_index, IntersectingElemnt>(face_shape_map_name));
 
     // bool map for affected edge
     using d_prop_bool = CGAL::dynamic_edge_property_t<bool>;