diff --git a/src/libslic3r/Fill/Lightning/Layer.cpp b/src/libslic3r/Fill/Lightning/Layer.cpp
index c381d55050..f3193afe49 100644
--- a/src/libslic3r/Fill/Lightning/Layer.cpp
+++ b/src/libslic3r/Fill/Lightning/Layer.cpp
@@ -129,9 +129,10 @@ GroundingLocation Layer::getBestGroundingLocation
             if (contour.size() > 2) {
                 Point prev = contour.points.back();
                 for (const Point &p2 : contour.points) {
-                    if (double d = Line::distance_to_squared(unsupported_location, prev, p2); d < d2) {
+                    Point closest_point;
+                    if (double d = line_alg::distance_to_squared(Line{prev, p2}, unsupported_location, &closest_point); d < d2) {
                         d2 = d;
-                        node_location = Geometry::foot_pt({ prev, p2 }, unsupported_location).cast<coord_t>();
+                        node_location = closest_point;
                     }
                     prev = p2;
                 }
diff --git a/src/slic3r/GUI/SendSystemInfoDialog.cpp b/src/slic3r/GUI/SendSystemInfoDialog.cpp
index 9a97532a73..03a38acbf1 100644
--- a/src/slic3r/GUI/SendSystemInfoDialog.cpp
+++ b/src/slic3r/GUI/SendSystemInfoDialog.cpp
@@ -141,7 +141,7 @@ static bool check_internet_connection_win()
 {
     bool internet = true; // return true if COM object creation fails.
 
-    if (CoInitializeEx(NULL, COINIT_APARTMENTTHREADED) == S_OK) {
+    if (SUCCEEDED(CoInitializeEx(NULL, COINIT_APARTMENTTHREADED))) {
         {
             CComPtr<INetworkListManager> pNLM;
             if (pNLM.CoCreateInstance(CLSID_NetworkListManager) == S_OK) {
diff --git a/src/slic3r/Utils/Http.cpp b/src/slic3r/Utils/Http.cpp
index 68ddda0410..a6ad54b32d 100644
--- a/src/slic3r/Utils/Http.cpp
+++ b/src/slic3r/Utils/Http.cpp
@@ -181,7 +181,7 @@ Http::priv::~priv()
 
 bool Http::priv::ca_file_supported(::CURL *curl)
 {
-#ifdef _WIN32
+#if defined(_WIN32) || defined(__APPLE__)
 	bool res = false;
 #else
 	bool res = true;
@@ -194,6 +194,7 @@ bool Http::priv::ca_file_supported(::CURL *curl)
 	if (::curl_easy_getinfo(curl, CURLINFO_TLS_SSL_PTR, &tls) == CURLE_OK) {
 		if (tls->backend == CURLSSLBACKEND_SCHANNEL || tls->backend == CURLSSLBACKEND_DARWINSSL) {
 			// With Windows and OS X native SSL support, cert files cannot be set
+            // DK: OSX is now not building CURL and links system one, thus we do not know which backend is installed. Still, false will be returned since the ifdef at the begining if this function.
 			res = false;
 		}
 	}