--- src/adw-settings-impl-macos.c	2024-05-24 13:03:30.000000000 +0800
+++ src/adw-settings-impl-macos.c	2024-06-10 07:43:01.000000000 +0800
@@ -8,6 +8,7 @@
 
 #include "adw-settings-impl-private.h"
 
+#include <AvailabilityMacros.h>
 #include <AppKit/AppKit.h>
 
 struct _AdwSettingsImplMacOS
@@ -41,6 +42,7 @@
 static AdwSystemColorScheme
 get_ns_color_scheme (void)
 {
+#if MAC_OS_X_VERSION_MIN_REQUIRED >= 101400
   if (@available(*, macOS 10.14)) {
     NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
     NSString *style = [userDefaults stringForKey:@"AppleInterfaceStyle"];
@@ -61,7 +63,7 @@
       ADW_SYSTEM_COLOR_SCHEME_PREFER_DARK :
       ADW_SYSTEM_COLOR_SCHEME_DEFAULT;
   }
-
+#endif
   return ADW_SYSTEM_COLOR_SCHEME_DEFAULT;
 }
 
@@ -90,7 +92,7 @@
 
   if (!enable_color_scheme)
     return ADW_SETTINGS_IMPL (self);
-
+#if MAC_OS_X_VERSION_MIN_REQUIRED >= 101400
   if (@available(*, macOS 10.14)) {
     static ThemeChangedObserver *observer;
 
@@ -108,6 +110,6 @@
                                     /* has_color_scheme */ TRUE,
                                     /* has_high_contrast */ FALSE);
   }
-
+#endif
   return ADW_SETTINGS_IMPL (self);
 }