A patch from stopiccot http://forum.vcmi.eu/viewtopic.php?p=8340#8340

lib/VCMIDirs.h

@@ -17,7 +17,6 @@
 	using namespace boost::filesystem;
 #endif
 
-
 /// Where to find the various VCMI files. This is mostly useful for linux. 
 class VCMIDirs {
 public:
@@ -31,10 +30,21 @@ public:
 		try {
 #ifdef ANDROID
 			UserPath = DATA_DIR;
+#elif defined(__APPLE__)
+            // This is Cocoa code that should be normally used to get path to Application Support folder but can't use it here for now...
+            // NSArray* urls = [[NSFileManager defaultManager] URLsForDirectory:NSApplicationSupportDirectory inDomains:NSUserDomainMask];
+            // UserPath = path([urls[0] path] + "/vcmi").string();
+            
+            // ...so here goes a bit of hardcode instead
+            std::string home_dir = ".";
+			if (getenv("HOME") != NULL )
+				home_dir = getenv("HOME");
+            
+			UserPath = path(home_dir + "/Library/Application Support/vcmi").string();
 #else
 			// Find vcmi user directory and create it if necessary
 			std::string home_dir = ".";
-			if( getenv("HOME") != NULL )
+			if (getenv("HOME") != NULL )
 				home_dir = getenv("HOME");
 
 			UserPath = path(home_dir + "/.vcmi").string();

osx/osx-vcmibuilder/vcmibuilder/AppDelegate.m

@@ -7,6 +7,10 @@
     installationCompleted = NO;
     outputDir = [[[NSBundle mainBundle] bundlePath] stringByAppendingString:@"/../../Data"];
     tempDir = NSTemporaryDirectory();
+    
+    // Output to Application Support
+    //NSArray* appSupportDirs = [[NSFileManager defaultManager] URLsForDirectory:NSApplicationSupportDirectory inDomains:NSUserDomainMask];
+    //outputDir = [[appSupportDirs[0] path] stringByAppendingString:@"/vcmi"];
 }
 
 - (BOOL)applicationShouldTerminateAfterLastWindowClosed:(NSApplication*)sender
@@ -243,7 +247,20 @@
     [self.installButton setTitle:@"Run VCMI"];
     [self.progressIndicator stopAnimation:self];
     
-    [NSApp requestUserAttention:NSCriticalRequest];
+    // Notify user that installation completed
+    NSUserNotification* notification = [[NSUserNotification alloc] init];
+    if (notification != nil) {
+        // On OS X 10.8 and newer use notification center
+        [notification setTitle:@"VCMI"];
+        [notification setInformativeText:@"Installation completed"];
+        [notification setDeliveryDate:[NSDate dateWithTimeInterval:0 sinceDate:[NSDate date]]];
+        [notification setSoundName:NSUserNotificationDefaultSoundName];
+        NSUserNotificationCenter *center = [NSUserNotificationCenter defaultUserNotificationCenter];
+        [center scheduleNotification:notification];
+    } else {
+        // On older OS X version force dock icon to jump
+        [NSApp requestUserAttention:NSCriticalRequest];
+    }
     
     // Hide all progress related controls
     [self.progressIndicator setHidden:YES];