update qmake file

Chronos.pro

@@ -1,17 +1,36 @@
 QT       += core gui
-greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
+greaterThan(QT_MAJOR_VERSION, 5): QT += widgets
 
 CONFIG += c++17
 
 # remove possible other optimization flags
-QMAKE_CXXFLAGS_RELEASE -= -O
-QMAKE_CXXFLAGS_RELEASE -= -O1
-QMAKE_CXXFLAGS_RELEASE *= -O2
+win32 {
+    message("Build for Windows")
+    QMAKE_CXXFLAGS_RELEASE -= -O
+    QMAKE_CXXFLAGS_RELEASE -= -O1
+    QMAKE_CXXFLAGS_RELEASE *= -O2
+
+    RC_ICONS = icon.ico
+}
+
+macx {
+    message("Build for macOS")
+    ICON = icon.icns
+    QMAKE_INFO_PLIST = Info.plist
+    QMAKE_CXXFLAGS_RELEASE -= -O
+    QMAKE_CXXFLAGS_RELEASE -= -O1
+    QMAKE_CXXFLAGS_RELEASE -= -O2
+    QMAKE_CXXFLAGS_RELEASE *= -O3
+    equals(QMAKE_APPLE_DEVICE_ARCHS, arm64) {
+        message("CPU Architecture : aarch64")
+        QMAKE_CXXFLAGS_RELEASE += -mcpu=apple-a14
+    }
+}
 
 # add the desired -O3 if not present, MinGW only
 # QMAKE_CXXFLAGS_RELEASE *= -O3
 
-RC_ICONS = icon.ico
+
 
 # The following define makes your compiler emit warnings if you use
 # any Qt feature that has been marked deprecated (the exact warnings