diff --git a/src/slic3r/GUI/GLCanvas3D.cpp b/src/slic3r/GUI/GLCanvas3D.cpp
index 3af81068d7..3dd672924a 100644
--- a/src/slic3r/GUI/GLCanvas3D.cpp
+++ b/src/slic3r/GUI/GLCanvas3D.cpp
@@ -123,14 +123,10 @@ void GLCanvas3D::LayersEditing::init()
 {
     glsafe(::glGenTextures(1, (GLuint*)&m_z_texture_id));
     glsafe(::glBindTexture(GL_TEXTURE_2D, m_z_texture_id));
-#if _WIN32 && ENABLE_GL_CORE_PROFILE
     if (!OpenGLManager::get_gl_info().is_core_profile() || !OpenGLManager::get_gl_info().is_mesa()) {
-#endif // _WIN32 && ENABLE_GL_CORE_PROFILE
         glsafe(::glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP));
         glsafe(::glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP));
-#if _WIN32 && ENABLE_GL_CORE_PROFILE
     }
-#endif // _WIN32 && ENABLE_GL_CORE_PROFILE
     glsafe(::glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR));
     glsafe(::glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_NEAREST));
     glsafe(::glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL, 1));
@@ -5325,14 +5321,18 @@ void GLCanvas3D::_picking_pass()
 
         glsafe(::glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT));
 
+#if !ENABLE_LEGACY_OPENGL_REMOVAL
         m_camera_clipping_plane = m_gizmos.get_clipping_plane();
         if (m_camera_clipping_plane.is_active()) {
-            ::glClipPlane(GL_CLIP_PLANE0, (GLdouble*)m_camera_clipping_plane.get_data());
+            ::glClipPlane(GL_CLIP_PLANE0, (GLdouble*)m_camera_clipping_plane.get_data().data());
             ::glEnable(GL_CLIP_PLANE0);
         }
+#endif // !ENABLE_LEGACY_OPENGL_REMOVAL
         _render_volumes_for_picking();
+#if !ENABLE_LEGACY_OPENGL_REMOVAL
         if (m_camera_clipping_plane.is_active())
             ::glDisable(GL_CLIP_PLANE0);
+#endif // !ENABLE_LEGACY_OPENGL_REMOVAL
 
 #if ENABLE_LEGACY_OPENGL_REMOVAL
         const Camera& camera = wxGetApp().plater()->get_camera();
diff --git a/src/slic3r/GUI/OpenGLManager.cpp b/src/slic3r/GUI/OpenGLManager.cpp
index 05c497c830..156581aaab 100644
--- a/src/slic3r/GUI/OpenGLManager.cpp
+++ b/src/slic3r/GUI/OpenGLManager.cpp
@@ -66,19 +66,15 @@ const std::string& OpenGLManager::GLInfo::get_renderer() const
     return m_renderer;
 }
 
-#if ENABLE_GL_CORE_PROFILE
 bool OpenGLManager::GLInfo::is_core_profile() const
 {
     return !GLEW_ARB_compatibility;
 }
 
-#if _WIN32
 bool OpenGLManager::GLInfo::is_mesa() const
 {
     return boost::icontains(m_version, "mesa");
 }
-#endif // _WIN32
-#endif // ENABLE_GL_CORE_PROFILE
 
 int OpenGLManager::GLInfo::get_max_tex_size() const
 {
@@ -198,25 +194,11 @@ std::string OpenGLManager::GLInfo::to_string(bool for_github) const
     out << b_start << "GLSL version: " << b_end << m_glsl_version << line_end;
 
     {
-        std::vector<std::string> extensions_list;
 #if ENABLE_GL_CORE_PROFILE
-        std::string extensions_str;
-        if (is_core_profile()) {
-            GLint n = 0;
-            glsafe(::glGetIntegerv(GL_NUM_EXTENSIONS, &n));
-            for (GLint i = 0; i < n; ++i) {
-                const char* extension = (const char*)::glGetStringi(GL_EXTENSIONS, i);
-                glcheck();
-                if (extension != nullptr)
-                    extensions_list.emplace_back(extension);
-            }
-        }
-        else {
-            extensions_str = gl_get_string_safe(GL_EXTENSIONS, "");
-            boost::split(extensions_list, extensions_str, boost::is_any_of(" "), boost::token_compress_on);
-        }
+        std::vector<std::string>  extensions_list = get_extensions_list();
 #else
         const std::string extensions_str = gl_get_string_safe(GL_EXTENSIONS, "");
+        std::vector<std::string> extensions_list;
         boost::split(extensions_list, extensions_str, boost::is_any_of(" "), boost::token_compress_on);
 #endif // ENABLE_GL_CORE_PROFILE
 
@@ -239,6 +221,31 @@ std::string OpenGLManager::GLInfo::to_string(bool for_github) const
     return out.str();
 }
 
+#if ENABLE_GL_CORE_PROFILE
+std::vector<std::string> OpenGLManager::GLInfo::get_extensions_list() const
+{
+    std::vector<std::string> ret;
+
+    if (is_core_profile()) {
+        GLint n = 0;
+        glsafe(::glGetIntegerv(GL_NUM_EXTENSIONS, &n));
+        ret.reserve(n);
+        for (GLint i = 0; i < n; ++i) {
+            const char* extension = (const char*)::glGetStringi(GL_EXTENSIONS, i);
+            glcheck();
+            if (extension != nullptr)
+                ret.emplace_back(extension);
+        }
+    }
+    else {
+        const std::string extensions_str = gl_get_string_safe(GL_EXTENSIONS, "");
+        boost::split(ret, extensions_str, boost::is_any_of(" "), boost::token_compress_on);
+    }
+
+    return ret;
+}
+#endif // ENABLE_GL_CORE_PROFILE
+
 OpenGLManager::GLInfo OpenGLManager::s_gl_info;
 bool OpenGLManager::s_compressed_textures_supported = false;
 OpenGLManager::EMultisampleState OpenGLManager::s_multisample = OpenGLManager::EMultisampleState::Unknown;
diff --git a/src/slic3r/GUI/OpenGLManager.hpp b/src/slic3r/GUI/OpenGLManager.hpp
index 6f3b990651..ed9beb8b50 100644
--- a/src/slic3r/GUI/OpenGLManager.hpp
+++ b/src/slic3r/GUI/OpenGLManager.hpp
@@ -43,12 +43,8 @@ public:
         const std::string& get_vendor() const;
         const std::string& get_renderer() const;
 
-#if ENABLE_GL_CORE_PROFILE
         bool is_core_profile() const;
-#if _WIN32
         bool is_mesa() const;
-#endif // _WIN32
-#endif // ENABLE_OPENGL_ES
 
         int get_max_tex_size() const;
         float get_max_anisotropy() const;
@@ -60,6 +56,10 @@ public:
         // Otherwise HTML formatted for the system info dialog.
         std::string to_string(bool for_github) const;
 
+#if ENABLE_GL_CORE_PROFILE
+        std::vector<std::string> get_extensions_list() const;
+#endif // ENABLE_GL_CORE_PROFILE
+
     private:
         void detect() const;
     };
diff --git a/src/slic3r/GUI/SendSystemInfoDialog.cpp b/src/slic3r/GUI/SendSystemInfoDialog.cpp
index 03a38acbf1..e8b4c33101 100644
--- a/src/slic3r/GUI/SendSystemInfoDialog.cpp
+++ b/src/slic3r/GUI/SendSystemInfoDialog.cpp
@@ -55,8 +55,10 @@ static const std::string SEND_SYSTEM_INFO_DOMAIN = "prusa3d.com";
 static const std::string SEND_SYSTEM_INFO_URL = "https://files." + SEND_SYSTEM_INFO_DOMAIN + "/wp-json/v1/ps";
 
 
+#if !ENABLE_GL_CORE_PROFILE
 // Declaration of a free function defined in OpenGLManager.cpp:
 std::string gl_get_string_safe(GLenum param, const std::string& default_value);
+#endif // !ENABLE_GL_CORE_PROFILE
 
 
 // A dialog with the information text and buttons send/dont send/ask later.
@@ -507,9 +509,13 @@ static std::string generate_system_info_json()
     opengl_node.put("Vendor", OpenGLManager::get_gl_info().get_vendor());
     opengl_node.put("Renderer", OpenGLManager::get_gl_info().get_renderer());
     // Generate list of OpenGL extensions:
+#if ENABLE_GL_CORE_PROFILE
+    std::vector<std::string> extensions_list = OpenGLManager::get_gl_info().get_extensions_list();
+#else
     std::string extensions_str = gl_get_string_safe(GL_EXTENSIONS, "");
     std::vector<std::string> extensions_list;
     boost::split(extensions_list, extensions_str, boost::is_any_of(" "), boost::token_compress_off);
+#endif // ENABLE_GL_CORE_PROFILE
     std::sort(extensions_list.begin(), extensions_list.end());
     pt::ptree extensions_node;
     for (const std::string& s : extensions_list) {