diff -rup solenv-orig/inc/settings.mk solenv/inc/settings.mk
--- solenv-orig/inc/settings.mk	2006-08-17 16:01:59.000000000 +0200
+++ solenv/inc/settings.mk	2006-08-17 16:02:36.000000000 +0200
@@ -1126,6 +1126,10 @@ CDEFS+=-DEXCEPTIONS_ON
 .ENDIF
 .ENDIF
 
+.IF "$(ENABLE_GSTREAMER)" == "TRUE"
+CDEFS+=-DGSTREAMER
+.ENDIF
+
 # compose flags and defines for GUI
 .IF "$(TARGETTYPE)"=="GUI"
 CDEFS+= $(CDEFSGUI)
