How Do I Invoke My Shaper?

[Eric Mader <mader jtcsv com>]

I've got my indic-xft shaper to build, and now I find that I can't figure 
out how to invoke it.

I have an OpenType Devanagari font. Following the directions in 
http://www.xfree86.org/current/fonts.html I used ttmkfdir to generate a 
fonts.scale file and mkfontdir to generate a font.dir. Here's fonts.scale:

2
Devamt.ttf -monotype-Devanagari MT for IBM-medium-r-normal--0-0-0-0-p-0-ascii-0
Devamt.ttf -monotype-Devanagari MT for 
IBM-medium-r-normal--0-0-0-0-p-0-iso8859-1

and here's fonts.dir:

2
Devamt.ttf -monotype-Devanagari MT for IBM-medium-r-normal--0-0-0-0-p-0-ascii-0
Devamt.ttf -monotype-Devanagari MT for 
IBM-medium-r-normal--0-0-0-0-p-0-iso8859-1

(I'm suspicious that it only shows ascii and iso8859-1 for encodings; the 
font has a Microsoft Unicode CMAP)

When I type the command "xset +fp /home/emader/deva-fonts" I get the following:

X Error of failed request:  86
  Major opcode of failed request:  51 (X_SetFontPath)
  Serial number of failed request:  9
  Current serial number in output stream:  11

Can someone please tell me what I have to do to get Pango to use this font?

Thanks,
Eric Mader