Hide menu bar on all screens in Mavericks

PseudoTerminal.m

@@ -4447,7 +4447,7 @@ NSString *sessionsKey = @"sessions";
         currentScreen = [NSScreen mainScreen];
     }
-    if (currentScreen == menubarScreen) {
+    if (currentScreen == menubarScreen || IsMavericksOrLater()) {
         int flags = NSApplicationPresentationAutoHideDock | NSApplicationPresentationAutoHideMenuBar;
         iTermApplicationDelegate *itad = (iTermApplicationDelegate *)[[iTermApplication sharedApplication] delegate];
         [itad setFutureApplicationPresentationOptions:flags unset:0];

iTerm.h

@@ -36,6 +36,7 @@
 #define OSX_TIGERORLATER (floor(NSAppKitVersionNumber) > 743)
 #define OSX_LEOPARDORLATER (floor(NSAppKitVersionNumber) > 824)
+BOOL IsMavericksOrLater(void);
 BOOL IsMountainLionOrLater(void);
 BOOL IsLionOrLater(void);
 BOOL IsSnowLeopardOrLater(void);

iTermController.m

@@ -124,6 +124,26 @@ BOOL IsLionOrLater(void) {
     return result;
 }
+static BOOL UncachedIsMavericksOrLater(void) {
+    unsigned major;
+    unsigned minor;
+    if ([iTermController getSystemVersionMajor:&major minor:&minor bugFix:nil]) {
+        return (major == 10 && minor >= 7) || (major > 10);
+    } else {
+        return NO;
+    }
+}
+
+BOOL IsMavericksOrLater(void) {
+    static BOOL result;
+    static BOOL initialized;
+    if (!initialized) {
+        initialized = YES;
+        result = UncachedIsMavericksOrLater();
+    }
+    return result;
+}
+
 BOOL IsSnowLeopardOrLater(void) {
     unsigned major;
     unsigned minor;