force stub system driver for headless mode

diff --git a/src/game/Doom2DF.lpr b/src/game/Doom2DF.lpr
index 7f869f160006312da7185f9baf3d2a2a8e88cfe6..758c4f9eb4fa2abc003b363db081ee87fa2f2fa1 100644 (file)
--- a/src/game/Doom2DF.lpr
+++ b/src/game/Doom2DF.lpr
@@ -57,6 +57,12 @@
   {$ERROR Sound driver not selected. Use -dUSE_SOUNDSTUB or -dUSE_SDLMIXER or -dUSE_FMOD or -dUSE_OPENAL}
 {$ENDIF}
 
+{$IFDEF HEADLESS}
+  {$IFNDEF USE_SYSSTUB}
+    {$ERROR Using system driver has no sense for headless build. Use -dUSE_SYSSTUB instead}
+  {$ENDIF}
+{$ENDIF}
+
 {$IFDEF ENABLE_HOLMES}
   {$IFDEF HEADLESS}
     {$ERROR Holmes in HEADLESS mode has no sense}