Trying to fix the remaining OSX warnings

src/slic3r/GUI/FirmwareDialog.cpp

@@ -648,7 +648,12 @@ void FirmwareDialog::priv::perform_upload()
 				}
 			}
 		})
-		.on_message([extra_verbose, q](const char* msg, unsigned /* size */) {
+		.on_message([
+#ifndef __APPLE__
+	        // clang complains when capturing constants.
+			extra_verbose,
+#endif // __APPLE__
+			q](const char* msg, unsigned /* size */) {
 			if (extra_verbose) {
 				BOOST_LOG_TRIVIAL(debug) << "avrdude: " << msg;
 			}

src/slic3r/GUI/GLCanvas3D.cpp

@@ -80,7 +80,7 @@ static constexpr const size_t MAX_VERTEX_BUFFER_SIZE     = 131072 * 6; // 3.15MB
 // Reserve size in number of floats.
 static constexpr const size_t VERTEX_BUFFER_RESERVE_SIZE = 131072 * 2; // 1.05MB
 // Reserve size in number of floats, maximum sum of all preallocated buffers.
-static constexpr const size_t VERTEX_BUFFER_RESERVE_SIZE_SUM_MAX = 1024 * 1024 * 128 / 4; // 128MB
+//static constexpr const size_t VERTEX_BUFFER_RESERVE_SIZE_SUM_MAX = 1024 * 1024 * 128 / 4; // 128MB
 
 namespace Slic3r {
 namespace GUI {

src/slic3r/Utils/MacDarkMode.mm

@@ -2,9 +2,12 @@
 
 #import <algorithm>
 
+#import <Cocoa/Cocoa.h>
 #import <Foundation/Foundation.h>
 #import <AppKit/NSScreen.h>
 
+@interface MacDarkMode : NSObject {}
+@end
 
 @implementation MacDarkMode