diff --git a/src/libslic3r/Point.hpp b/src/libslic3r/Point.hpp
index 1a1eeb8c5b..32dcb82d05 100644
--- a/src/libslic3r/Point.hpp
+++ b/src/libslic3r/Point.hpp
@@ -112,7 +112,7 @@ inline double angle(const Eigen::MatrixBase<Derived> &v1, const Eigen::MatrixBas
 template<typename Derived>
 Eigen::Matrix<typename Derived::Scalar, 2, 1, Eigen::DontAlign> to_2d(const Eigen::MatrixBase<Derived> &ptN) {
     static_assert(Derived::IsVectorAtCompileTime && int(Derived::SizeAtCompileTime) >= 3, "to_2d(): first parameter is not a 3D or higher dimensional vector");
-    return ptN.head<2>();
+    return ptN.template head<2>();
 }
 
 template<typename Derived>
diff --git a/src/libslic3r/SupportSpotsGenerator.cpp b/src/libslic3r/SupportSpotsGenerator.cpp
index 66c6de7a9d..c714bc7c11 100644
--- a/src/libslic3r/SupportSpotsGenerator.cpp
+++ b/src/libslic3r/SupportSpotsGenerator.cpp
@@ -121,7 +121,7 @@ public:
 
     Vec3f get_cell_center(const Vec3i &cell_coords) const
     {
-        return origin + cell_coords.cast<float>().cwiseProduct(this->cell_size) + this->cell_size.cwiseQuotient(Vec3f(2.0f, 2.0f, 2.0));
+        return origin + cell_coords.cast<float>().cwiseProduct(this->cell_size) + this->cell_size.cwiseQuotient(Vec3f(2.0f, 2.0f, 2.0f));
     }
 
     void take_position(const Vec3f &position) { taken_cells.insert(to_cell_index(to_cell_coords(position))); }
@@ -199,16 +199,6 @@ struct ExtrusionPropertiesAccumulator
     }
 };
 
-// base function: ((e^(((1)/(x^(2)+1)))-1)/(e-1))
-// checkout e.g. here: https://www.geogebra.org/calculator
-float gauss(float value, float mean_x_coord, float mean_value, float falloff_speed)
-{
-    float shifted     = value - mean_x_coord;
-    float denominator = falloff_speed * shifted * shifted + 1.0f;
-    float exponent    = 1.0f / denominator;
-    return mean_value * (std::exp(exponent) - 1.0f) / (std::exp(1.0f) - 1.0f);
-}
-
 std::vector<ExtrusionLine> to_short_lines(const ExtrusionEntity *e, float length_limit)
 {
     assert(!e->is_collection());
diff --git a/src/libslic3r/TriangleMeshSlicer.cpp b/src/libslic3r/TriangleMeshSlicer.cpp
index 9374ebc870..85e170bd03 100644
--- a/src/libslic3r/TriangleMeshSlicer.cpp
+++ b/src/libslic3r/TriangleMeshSlicer.cpp
@@ -206,7 +206,7 @@ inline FacetSliceType slice_facet(
                 // All three vertices are aligned with slice_z.
                 line_out.edge_type = IntersectionLine::FacetEdgeType::Horizontal;
                 result = FacetSliceType::Cutting;
-                double normal = cross2((to_2d(v1) - to_2d(v0)).cast<double>(), (to_2d(v2) - to_2d(v1)).cast<double>());
+                double normal = cross2((to_2d(v1) - to_2d(v0)).template cast<double>(), (to_2d(v2) - to_2d(v1)).template cast<double>());
                 if (normal < 0) {
                     // If normal points downwards this is a bottom horizontal facet so we reverse its point order.
                     std::swap(a, b);
@@ -292,7 +292,7 @@ inline FacetSliceType slice_facet(
             static_cast<Point&>(point) =
                 t <= 0. ? v3f_scaled_to_contour_point(*a) :
                 t >= 1. ? v3f_scaled_to_contour_point(*b) :
-                v3f_scaled_to_contour_point(a->head<2>().cast<double>() * (1. - t) + b->head<2>().cast<double>() * t + Vec2d(0.5, 0.5));
+                v3f_scaled_to_contour_point(a->template head<2>().template cast<double>() * (1. - t) + b->template head<2>().template cast<double>() * t + Vec2d(0.5, 0.5));
             point.edge_id = edge_id;
             ++ num_points;
 #endif