diff --git a/cmake/QtFrameworkHelpers.cmake b/cmake/QtFrameworkHelpers.cmake
index 0f776ec0dbb..51b50cf2945 100644
--- a/cmake/QtFrameworkHelpers.cmake
+++ b/cmake/QtFrameworkHelpers.cmake
@@ -53,6 +53,16 @@ function(qt_internal_find_apple_system_framework out_var framework_name)
 
     find_library(${cache_var_name} "${framework_name}")
 
+    # Dirty hack for 10.15 build
+    if("${framework_name}" STREQUAL "UniformTypeIdentifiers")
+        if(${cache_var_name} AND NOT ${cache_var_name} MATCHES "^/System/Library/Frameworks.*")
+            set(${out_var} "-weak_framework ${framework_name}" PARENT_SCOPE)
+        else()
+            set(${out_var} "" PARENT_SCOPE)
+        endif()
+        return()
+    endif()
+
     if(${cache_var_name} AND ${cache_var_name} MATCHES ".framework$")
         set(${out_var} "-framework ${framework_name}" PARENT_SCOPE)
     else()
diff --git a/src/corelib/platform/darwin/qdarwinpermissionplugin_location.mm b/src/corelib/platform/darwin/qdarwinpermissionplugin_location.mm
index 1d32c0fcacb..3859619c2c0 100644
--- a/src/corelib/platform/darwin/qdarwinpermissionplugin_location.mm
+++ b/src/corelib/platform/darwin/qdarwinpermissionplugin_location.mm
@@ -104,8 +104,10 @@ - (instancetype)init
 - (CLAuthorizationStatus)authorizationStatus
 {
     if (self.manager) {
+#if QT_MACOS_PLATFORM_SDK_EQUAL_OR_ABOVE(110000)
         if (@available(macOS 11, iOS 14, *))
             return self.manager.authorizationStatus;
+#endif
     }
 
     return QT_IGNORE_DEPRECATIONS(CLLocationManager.authorizationStatus);
@@ -113,6 +115,7 @@ - (CLAuthorizationStatus)authorizationStatus
 
 - (Qt::PermissionStatus)accuracyAuthorization:(QLocationPermission)permission
 {
+#if QT_MACOS_PLATFORM_SDK_EQUAL_OR_ABOVE(110000)
     auto status = CLAccuracyAuthorizationReducedAccuracy;
     if (@available(macOS 11, iOS 14, *))
         status = self.manager.accuracyAuthorization;
@@ -129,6 +132,9 @@ - (CLAuthorizationStatus)authorizationStatus
 
     qCWarning(lcPermissions) << "Unknown accuracy status" << status << "detected in" << self;
     return Qt::PermissionStatus::Denied;
+#else
+    return Qt::PermissionStatus::Granted;
+#endif
 }
 
 - (QStringList)usageDescriptionsFor:(QPermission)permission
@@ -176,9 +182,11 @@ - (void)requestQueuedPermission
         // The documentation specifies that requestWhenInUseAuthorization can
         // only be called when the current authorization status is undetermined.
         switch ([self authorizationStatus]) {
+#if QT_MACOS_PLATFORM_SDK_EQUAL_OR_ABOVE(110000)
         case kCLAuthorizationStatusNotDetermined:
             [self.manager requestWhenInUseAuthorization];
             break;
+#endif
         default:
             [self deliverResult];
         }
diff --git a/src/gui/platform/darwin/qappleiconengine.mm b/src/gui/platform/darwin/qappleiconengine.mm
index d99da6da841..579721c816e 100644
--- a/src/gui/platform/darwin/qappleiconengine.mm
+++ b/src/gui/platform/darwin/qappleiconengine.mm
@@ -279,7 +279,12 @@
     });
     NSString *systemIconName = it != std::end(iconMap) ? it->second : iconName.toNSString();
 #if defined(Q_OS_MACOS)
-    return [NSImage imageWithSystemSymbolName:systemIconName accessibilityDescription:nil];
+#if QT_MACOS_PLATFORM_SDK_EQUAL_OR_ABOVE(110000)
+    if (@available(macOS 11.0, *)) {
+        return [NSImage imageWithSystemSymbolName:systemIconName accessibilityDescription:nil];
+    }
+#endif
+    return (NSImage *)nil;
 #elif defined(QT_PLATFORM_UIKIT)
     return [UIImage systemImageNamed:systemIconName];
 #endif
@@ -357,22 +362,29 @@
 
 namespace {
 #if defined(Q_OS_MACOS)
-auto *configuredImage(const NSImage *image, const QColor &color)
+const auto *configuredImage(const NSImage *image, const QColor &color)
 {
-    auto *config = [NSImageSymbolConfiguration configurationWithPointSize:48
-                                               weight:NSFontWeightRegular
-                                               scale:NSImageSymbolScaleLarge];
-    if (@available(macOS 12, *)) {
-        auto *primaryColor = [NSColor colorWithSRGBRed:color.redF()
-                                                 green:color.greenF()
-                                                  blue:color.blueF()
-                                                 alpha:color.alphaF()];
-
-        auto *colorConfig = [NSImageSymbolConfiguration configurationWithHierarchicalColor:primaryColor];
-        config = [config configurationByApplyingConfiguration:colorConfig];
-    }
+#if QT_MACOS_PLATFORM_SDK_EQUAL_OR_ABOVE(110000)
+    if (@available(macOS 11, *)) {
+        auto *config = [NSImageSymbolConfiguration configurationWithPointSize:48
+                                                   weight:NSFontWeightRegular
+                                                   scale:NSImageSymbolScaleLarge];
+#if QT_MACOS_PLATFORM_SDK_EQUAL_OR_ABOVE(120000)
+        if (@available(macOS 12, *)) {
+            auto *primaryColor = [NSColor colorWithSRGBRed:color.redF()
+                                                     green:color.greenF()
+                                                      blue:color.blueF()
+                                                     alpha:color.alphaF()];
+
+            auto *colorConfig = [NSImageSymbolConfiguration configurationWithHierarchicalColor:primaryColor];
+            config = [config configurationByApplyingConfiguration:colorConfig];
+        }
+#endif
 
-    return [image imageWithSymbolConfiguration:config];
+        return [image imageWithSymbolConfiguration:config];
+    }
+#endif
+    return image;
 }
 #elif defined(QT_PLATFORM_UIKIT)
 auto *configuredImage(const UIImage *image, const QColor &color)
diff --git a/src/gui/rhi/qrhimetal.mm b/src/gui/rhi/qrhimetal.mm
index a5edb2a9265..267faed40dd 100644
--- a/src/gui/rhi/qrhimetal.mm
+++ b/src/gui/rhi/qrhimetal.mm
@@ -173,7 +173,9 @@ void destroy() {
     QRhiMetal *q;
     id<MTLDevice> dev = nil;
     id<MTLCommandQueue> cmdQueue = nil;
+#if QT_MACOS_PLATFORM_SDK_EQUAL_OR_ABOVE(110000)
     API_AVAILABLE(macosx(11.0), ios(14.0)) id<MTLBinaryArchive> binArch = nil;
+#endif
 
     id<MTLCommandBuffer> newCommandBuffer();
     MTLRenderPassDescriptor *createDefaultRenderPass(bool hasDepthStencil,
@@ -528,6 +530,7 @@ inline Int aligned(Int v, Int byteAlign)
     return false;
 #endif
 
+#if QT_MACOS_PLATFORM_SDK_EQUAL_OR_ABOVE(110000)
     if (@available(macOS 11.0, iOS 14.0, *)) {
         [binArch release];
         MTLBinaryArchiveDescriptor *binArchDesc = [MTLBinaryArchiveDescriptor new];
@@ -542,6 +545,7 @@ inline Int aligned(Int v, Int byteAlign)
         }
         return true;
     }
+#endif
     return false;
 }
 
@@ -567,7 +571,7 @@ inline Int aligned(Int v, Int byteAlign)
     // suitable as deviceId because it does not seem stable on macOS and can
     // apparently change when the system is rebooted.
 
-#ifdef Q_OS_MACOS
+#if defined(Q_OS_MACOS) && QT_MACOS_PLATFORM_SDK_EQUAL_OR_ABOVE(101500)
     if (@available(macOS 10.15, *)) {
         const MTLDeviceLocation deviceLocation = [d->dev location];
         switch (deviceLocation) {
@@ -608,8 +612,10 @@ inline Int aligned(Int v, Int byteAlign)
 #if defined(Q_OS_MACOS)
     caps.maxTextureSize = 16384;
     caps.baseVertexAndInstance = true;
-    if (@available(macOS 10.15, *))
+#if QT_MACOS_PLATFORM_SDK_EQUAL_OR_ABOVE(110000)
+    if (@available(macOS 11.0, *))
         caps.isAppleGPU = [d->dev supportsFamily:MTLGPUFamilyApple7];
+#endif
     caps.maxThreadGroupSize = 1024;
     caps.multiView = true;
 #elif defined(Q_OS_TVOS)
@@ -666,10 +672,12 @@ inline Int aligned(Int v, Int byteAlign)
     [d->captureScope release];
     d->captureScope = nil;
 
+#if QT_MACOS_PLATFORM_SDK_EQUAL_OR_ABOVE(110000)
     if (@available(macOS 11.0, iOS 14.0, *)) {
         [d->binArch release];
         d->binArch = nil;
     }
+#endif
 
     [d->cmdQueue release];
     if (!importedCmdQueue)
@@ -817,9 +825,11 @@ inline Int aligned(Int v, Int byteAlign)
         return true;
     case QRhi::PipelineCacheDataLoadSave:
     {
+#if QT_MACOS_PLATFORM_SDK_EQUAL_OR_ABOVE(110000)
         if (@available(macOS 11.0, iOS 14.0, *))
             return true;
         else
+#endif
             return false;
     }
     case QRhi::ImageDataStride:
@@ -949,6 +959,7 @@ inline Int aligned(Int v, Int byteAlign)
 {
     Q_STATIC_ASSERT(sizeof(QMetalPipelineCacheDataHeader) == 256);
     QByteArray data;
+#if QT_MACOS_PLATFORM_SDK_EQUAL_OR_ABOVE(110000)
     if (@available(macOS 11.0, iOS 14.0, *)) {
         if (!d->binArch || !rhiFlags.testFlag(QRhi::EnablePipelineCacheDataSave))
             return data;
@@ -997,6 +1008,7 @@ inline Int aligned(Int v, Int byteAlign)
         memcpy(data.data(), &header, headerSize);
         memcpy(data.data() + headerSize, blob.constData(), dataSize);
     }
+#endif
     return data;
 }
 
@@ -1046,6 +1058,7 @@ inline Int aligned(Int v, Int byteAlign)
         return;
     }
 
+#if QT_MACOS_PLATFORM_SDK_EQUAL_OR_ABOVE(110000)
     if (@available(macOS 11.0, iOS 14.0, *)) {
         const char *p = data.constData() + dataOffset;
 
@@ -1062,6 +1075,7 @@ inline Int aligned(Int v, Int byteAlign)
         if (d->setupBinaryArchive(url))
             qCDebug(QRHI_LOG_INFO, "Created MTLBinaryArchive with initial data of %u bytes", header.dataSize);
     }
+#endif
 }
 
 QRhiRenderBuffer *QRhiMetal::createRenderBuffer(QRhiRenderBuffer::Type type, const QSize &pixelSize,
@@ -3523,6 +3537,7 @@ static inline MTLPixelFormat toMetalTextureFormat(QRhiTexture::Format format, QR
     case QRhiTexture::ASTC_12x12:
         return srgb ? MTLPixelFormatASTC_12x12_sRGB : MTLPixelFormatASTC_12x12_LDR;
 #else
+#if QT_MACOS_PLATFORM_SDK_EQUAL_OR_ABOVE(110000)
     case QRhiTexture::ETC2_RGB8:
         if (d->caps.isAppleGPU) {
             if (@available(macOS 11.0, *))
@@ -3642,6 +3657,7 @@ static inline MTLPixelFormat toMetalTextureFormat(QRhiTexture::Format format, QR
         }
         qWarning("QRhiMetal: ASTC compression not supported on this platform");
         return MTLPixelFormatInvalid;
+#endif
 #endif
 
     default:
@@ -3707,12 +3723,14 @@ static inline MTLPixelFormat toMetalTextureFormat(QRhiTexture::Format format, QR
     case DepthStencil:
 #ifdef Q_OS_MACOS
         if (rhiD->caps.isAppleGPU) {
+#if QT_MACOS_PLATFORM_SDK_EQUAL_OR_ABOVE(110000)
             if (@available(macOS 11.0, *)) {
                 desc.storageMode = MTLStorageModeMemoryless;
                 d->format = MTLPixelFormatDepth32Float_Stencil8;
             } else {
                 Q_UNREACHABLE();
             }
+#endif
         } else {
             desc.storageMode = MTLStorageModePrivate;
             d->format = rhiD->d->dev.depth24Stencil8PixelFormatSupported
@@ -5000,16 +5018,19 @@ static inline MTLLanguageVersion toMetalLanguageVersion(const QShaderVersion &ve
 
 void QRhiMetalData::trySeedingRenderPipelineFromBinaryArchive(MTLRenderPipelineDescriptor *rpDesc)
 {
+#if QT_MACOS_PLATFORM_SDK_EQUAL_OR_ABOVE(110000)
     if (@available(macOS 11.0, iOS 14.0, *)) {
         if (binArch)  {
             NSArray *binArchArray = [NSArray arrayWithObjects: binArch, nil];
             rpDesc.binaryArchives = binArchArray;
         }
     }
+#endif
 }
 
 void QRhiMetalData::addRenderPipelineToBinaryArchive(MTLRenderPipelineDescriptor *rpDesc)
 {
+#if QT_MACOS_PLATFORM_SDK_EQUAL_OR_ABOVE(110000)
     if (@available(macOS 11.0, iOS 14.0, *)) {
         if (binArch) {
             NSError *err = nil;
@@ -5019,6 +5040,7 @@ static inline MTLLanguageVersion toMetalLanguageVersion(const QShaderVersion &ve
             }
         }
     }
+#endif
 }
 
 bool QMetalGraphicsPipeline::createVertexFragmentPipeline()
@@ -5986,16 +6008,19 @@ static inline bool matches(const QShaderDescription::InOutVariable &a, const QSh
 
 void QRhiMetalData::trySeedingComputePipelineFromBinaryArchive(MTLComputePipelineDescriptor *cpDesc)
 {
+#if QT_MACOS_PLATFORM_SDK_EQUAL_OR_ABOVE(110000)
     if (@available(macOS 11.0, iOS 14.0, *)) {
         if (binArch)  {
             NSArray *binArchArray = [NSArray arrayWithObjects: binArch, nil];
             cpDesc.binaryArchives = binArchArray;
         }
     }
+#endif
 }
 
 void QRhiMetalData::addComputePipelineToBinaryArchive(MTLComputePipelineDescriptor *cpDesc)
 {
+#if QT_MACOS_PLATFORM_SDK_EQUAL_OR_ABOVE(110000)
     if (@available(macOS 11.0, iOS 14.0, *)) {
         if (binArch) {
             NSError *err = nil;
@@ -6005,6 +6030,7 @@ static inline bool matches(const QShaderDescription::InOutVariable &a, const QSh
             }
         }
     }
+#endif
 }
 
 bool QMetalComputePipeline::create()
@@ -6278,9 +6304,11 @@ static inline bool matches(const QShaderDescription::InOutVariable &a, const QSh
         else
             return false;
     } else if (f == HDRExtendedDisplayP3Linear) {
+#if QT_MACOS_PLATFORM_SDK_EQUAL_OR_ABOVE(110000)
         if (@available(macOS 11.0, iOS 14.0, *))
             return hdrInfo().limits.colorComponentValue.maxPotentialColorComponentValue > 1.0f;
         else
+#endif
             return false;
     }
     return f == SDR;
@@ -6371,10 +6399,12 @@ static inline bool matches(const QShaderDescription::InOutVariable &a, const QSh
             d->layer.wantsExtendedDynamicRangeContent = YES;
         }
     } else if (m_format == HDRExtendedDisplayP3Linear) {
+#if QT_MACOS_PLATFORM_SDK_EQUAL_OR_ABOVE(110000)
         if (@available(macOS 11.0, iOS 16.0, *)) {
             d->layer.colorspace = CGColorSpaceCreateWithName(kCGColorSpaceExtendedLinearDisplayP3);
             d->layer.wantsExtendedDynamicRangeContent = YES;
         }
+#endif
     }
 
     if (m_flags.testFlag(UsedAsTransferSource))
diff --git a/src/plugins/platforms/cocoa/qcocoaapplicationdelegate.mm b/src/plugins/platforms/cocoa/qcocoaapplicationdelegate.mm
index fc871be5f32..1a9a6dbbac0 100644
--- a/src/plugins/platforms/cocoa/qcocoaapplicationdelegate.mm
+++ b/src/plugins/platforms/cocoa/qcocoaapplicationdelegate.mm
@@ -393,10 +393,12 @@ - (void)getUrl:(NSAppleEventDescriptor *)event withReplyEvent:(NSAppleEventDescr
 
 - (BOOL)applicationSupportsSecureRestorableState:(NSApplication *)application
 {
+#if QT_MACOS_PLATFORM_SDK_EQUAL_OR_ABOVE(120000)
     if (@available(macOS 12, *)) {
         if ([reflectionDelegate respondsToSelector:_cmd])
             return [reflectionDelegate applicationSupportsSecureRestorableState:application];
     }
+#endif
 
     // We don't support or implement state restorations via the AppKit
     // state restoration APIs, but if we did, we would/should support
diff --git a/src/plugins/platforms/cocoa/qcocoafiledialoghelper.mm b/src/plugins/platforms/cocoa/qcocoafiledialoghelper.mm
index 41170b74eaa..c9ea202201f 100644
--- a/src/plugins/platforms/cocoa/qcocoafiledialoghelper.mm
+++ b/src/plugins/platforms/cocoa/qcocoafiledialoghelper.mm
@@ -25,7 +25,9 @@
 #include <qpa/qplatformtheme.h>
 #include <qpa/qplatformnativeinterface.h>
 
+#if QT_MACOS_PLATFORM_SDK_EQUAL_OR_ABOVE(110000)
 #include <UniformTypeIdentifiers/UniformTypeIdentifiers.h>
+#endif
 
 QT_USE_NAMESPACE
 
@@ -305,7 +307,11 @@ - (BOOL)panel:(id)sender validateURL:(NSURL *)url error:(NSError * _Nullable *)o
                         fileInfo.absoluteDir().dirName().toNSString()];
 
             auto *replaceButton = [alert addButtonWithTitle:qt_mac_AppKitString(@"SavePanel", @"Replace")];
-            replaceButton.hasDestructiveAction = YES;
+#if QT_MACOS_PLATFORM_SDK_EQUAL_OR_ABOVE(110000)
+            if (@available(macOS 11, *)) {
+                replaceButton.hasDestructiveAction = YES;
+            }
+#endif
             replaceButton.tag = 1337;
             [alert addButtonWithTitle:qt_mac_AppKitString(@"Common", @"Cancel")];
 
@@ -454,15 +460,19 @@ - (void)updateProperties
     // We work around this by temporarily resetting the allowed
     // content type to one without an extension, which forces
     // the save panel to update and remove the extension.
-    const bool nameFieldHasExtension = m_panel.nameFieldStringValue.pathExtension.length > 0;
-    if (!m_panel.allowedFileTypes && !nameFieldHasExtension && !openpanel_cast(m_panel)) {
-        if (!UTTypeDirectory.preferredFilenameExtension) {
-            m_panel.allowedContentTypes = @[ UTTypeDirectory ];
-            m_panel.allowedFileTypes = nil;
-        } else {
-            qWarning() << "UTTypeDirectory unexpectedly reported an extension";
+#if QT_MACOS_PLATFORM_SDK_EQUAL_OR_ABOVE(110000)
+    if (@available(macOS 11.0, *)) {
+        const bool nameFieldHasExtension = m_panel.nameFieldStringValue.pathExtension.length > 0;
+        if (!m_panel.allowedFileTypes && !nameFieldHasExtension && !openpanel_cast(m_panel)) {
+            if (!UTTypeDirectory.preferredFilenameExtension) {
+                m_panel.allowedContentTypes = @[ UTTypeDirectory ];
+                m_panel.allowedFileTypes = nil;
+            } else {
+                qWarning() << "UTTypeDirectory unexpectedly reported an extension";
+            }
         }
     }
+#endif
 
     m_panel.showsHiddenFiles = m_options->filter().testFlag(QDir::Hidden);
 
diff --git a/src/plugins/platforms/cocoa/qcocoamessagedialog.mm b/src/plugins/platforms/cocoa/qcocoamessagedialog.mm
index 84525099c96..cfc73e67938 100644
--- a/src/plugins/platforms/cocoa/qcocoamessagedialog.mm
+++ b/src/plugins/platforms/cocoa/qcocoamessagedialog.mm
@@ -170,8 +170,10 @@ At this point the options() will reflect the specific dialog shown.
         else if ([button.keyEquivalent isEqualToString:@"\e"])
             button.keyEquivalent = @"";
 
+#if QT_MACOS_PLATFORM_SDK_EQUAL_OR_ABOVE(110000)
         if (@available(macOS 11, *))
             button.hasDestructiveAction = role == DestructiveRole;
+#endif
 
         // The NSModalResponse of showing an NSAlert normally depends on the order of the
         // button that was clicked, starting from the right with NSAlertFirstButtonReturn (1000),
diff --git a/src/plugins/platforms/cocoa/qcocoawindow.mm b/src/plugins/platforms/cocoa/qcocoawindow.mm
index b4c8ae4ba1f..e86777d1312 100644
--- a/src/plugins/platforms/cocoa/qcocoawindow.mm
+++ b/src/plugins/platforms/cocoa/qcocoawindow.mm
@@ -293,19 +293,29 @@ a normal (not maximized or full screen) top-level window.
     // the current view (by setting additionalSafeAreaInsets). If the window
     // uses NSWindowStyleMaskFullSizeContentView this also includes the area
     // of the view covered by the title bar.
-    QMarginsF viewSafeAreaMargins = {
-        m_view.safeAreaInsets.left,
-        m_view.safeAreaInsets.top,
-        m_view.safeAreaInsets.right,
-        m_view.safeAreaInsets.bottom
-    };
+    QMarginsF viewSafeAreaMargins;
+#if QT_MACOS_PLATFORM_SDK_EQUAL_OR_ABOVE(110000)
+    if (@available(macOS 11, *)) {
+        viewSafeAreaMargins = {
+            m_view.safeAreaInsets.left,
+            m_view.safeAreaInsets.top,
+            m_view.safeAreaInsets.right,
+            m_view.safeAreaInsets.bottom
+        };
+    }
+#endif
 
     // The screen's safe area insets represent the distances from the screen's
     // edges at which content isn't obscured. The view's safe area margins do
     // not include the screen's insets automatically, so we need to manually
     // merge them.
     auto screenRect = m_view.window.screen.frame;
-    auto screenInsets = m_view.window.screen.safeAreaInsets;
+    NSEdgeInsets screenInsets = NSEdgeInsetsZero;
+#if QT_MACOS_PLATFORM_SDK_EQUAL_OR_ABOVE(120000)
+    if (@available(macOS 12, *)) {
+        screenInsets = m_view.window.screen.safeAreaInsets;
+    }
+#endif
     auto screenRelativeViewBounds = QCocoaScreen::mapFromNative(
         [m_view.window convertRectToScreen:
             [m_view convertRect:m_view.bounds toView:nil]]