diff --git a/Source/Project64/User Interface.h b/Source/Project64/User Interface.h
index f430de71d..713f18a9d 100644
--- a/Source/Project64/User Interface.h	
+++ b/Source/Project64/User Interface.h	
@@ -44,8 +44,14 @@ struct WINDOWS_PAINTSTRUCT {
 
 class CN64System;
 
+#define WINDOWS_UI
+// Remove this to test compilation outside of the Windows ATL environment.
+
+#ifdef WINDOWS_UI
 #include <WTL App.h>
+#endif
 #include <User Interface/MenuShortCuts.h>
+
 #include ".\\User Interface\\Rom Browser.h"
 #include ".\\User Interface\\Gui Class.h"
 #include ".\\User Interface\\Menu Class.h"
@@ -54,4 +60,6 @@ class CN64System;
 #include ".\\User Interface\\Notification Class.h"
 #include ".\\User Interface\\Frame Per Second Class.h"
 #include ".\\User Interface\\resource.h"
+#ifdef WINDOWS_UI
 #include ".\\User Interface\\Settings Config.h"
+#endif
diff --git a/Source/Project64/main.cpp b/Source/Project64/main.cpp
index 775184ab0..60cb62acc 100644
--- a/Source/Project64/main.cpp
+++ b/Source/Project64/main.cpp
@@ -178,7 +178,20 @@ const char * AppName ( void )
 	return Name.c_str();
 }
 
-int WINAPI WinMain(HINSTANCE /*hInstance*/, HINSTANCE /*hPrevInstance*/, LPSTR /*lpszArgs*/, int /*nWinMode*/) 
+#ifndef WINDOWS_UI
+int main(int argc, char* argv[])
+{
+#error Cross-platform [graphical?] interface has not yet been implemented.
+// Remove this #error to compile, but linking will fail with about 10 errors.
+
+    while (argc >= 0)
+    {
+        puts(argv[--argc]);
+    }
+    return 0;
+}
+#else
+int WINAPI WinMain(HINSTANCE /*hInstance*/, HINSTANCE /*hPrevInstance*/, LPSTR /*lpszArgs*/, int /*nWinMode*/)
 {
 	FixDirectories();
 
@@ -280,3 +293,4 @@ int WINAPI WinMain(HINSTANCE /*hInstance*/, HINSTANCE /*hPrevInstance*/, LPSTR /
 	CloseTrace();
 	return true;
 }
+#endif