diff --git a/uisimulator/x11/Makefile b/uisimulator/x11/Makefile
index 60fad08d0e..0c96a77147 100644
--- a/uisimulator/x11/Makefile
+++ b/uisimulator/x11/Makefile
@@ -52,12 +52,16 @@ ifeq ($(UNAME),Linux)
   INCLUDES += -I/usr/X11R6/include
   LIBDIRS = -L/usr/X11R6/lib
   DEFINES += -DLINUX
- # MPEG_PLAY = 1
+  MPEG_PLAY = 1
 else
   DEFINES += -DBIG_ENDIAN
   LIBDIRS = 
 endif
 
+ifdef MPEG_PLAY
+  INCLUDES += -I$(PREVAPPDIR)/common
+endif
+
 CFLAGS = $(DEBUG) $(DEFINES) $(INCLUDES)
 
 #SRCS = $(wildcard *.c)