--- a/hw/xfree86/vbe/Makefile.am	
+++ a/hw/xfree86/vbe/Makefile.am	
@@ -6,5 +6,7 @@ 
 
 AM_CFLAGS = $(DIX_CFLAGS) $(XORG_CFLAGS)
 
+AM_CPPFLAGS = -U_FORTIFY_SOURCE
+
 INCLUDES = $(XORG_INCS) -I$(srcdir)/../ddc -I$(srcdir)/../i2c \
            -I$(srcdir)/../int10