Fix 3572: Xcode no longer supports Sierra

Author: pljones

Jamulus.pro

@@ -174,11 +174,11 @@ win32 {
 
 } else:macx {
     # Set minimum macOS deployment target
-    # For Qt 5: Support back to macOS 10.12 (Sierra) for legacy builds on Intel
+    # For Qt 5: Support back to macOS 10.13 (High Sierra) for legacy builds on Intel
     # For Qt 6: Support macOS 11 (Big Sur) and later for universal binaries
     lessThan(QT_MAJOR_VERSION, 6) {
-        QMAKE_MACOSX_DEPLOYMENT_TARGET = 10.12
-        message(Qt5 build: Setting macOS deployment target to 10.12)
+        QMAKE_MACOSX_DEPLOYMENT_TARGET = 10.13
+        message(Qt5 build: Setting macOS deployment target to 10.13)
     } else {
         QMAKE_MACOSX_DEPLOYMENT_TARGET = 11.0
         message(Qt6 build: Setting macOS deployment target to 11.0)