Here is the patch to apply X-TT 1.3 to XFree86-3.3.6 .
You should apply this patch just after applying
the "shared-libfont-1.2.diff" patch contained in the X-TT 1.3 distribution.

--- xc/programs/Xserver/Imakefile.bak	Wed Apr 26 23:57:10 2000
+++ xc/programs/Xserver/Imakefile	Wed Apr 26 23:57:53 2000
@@ -151,7 +151,7 @@
           CFB32 = cfb/LibraryTargetName(cfb) cfb32/LibraryTargetName(cfb)
              MI = mi/LibraryTargetName(mi)
             DIX = dix/LibraryTargetName(dix)
-           FONT = $(DEPFONTLIB)
+           FONT = $(FONTLIB) $(XPFBLIBS)
 #if UsbMouseSupport 
 #if !HasLibUsb
             USB = $(XF86OSSRC)/libusb/LibraryTargetName(usb)