gub3 build fail: fonts

[Graham Percival]

With the attached patch and building with
  ABI=32 make lilypond
the tools are built and the lilypond binary appears to build.
However, the overall build process dies with font-related errors:

...
Renaming input to:
`/home/lilypond/gub/target/linux-x86/src/lilypond-git.sv.gnu.org--lilypond.git-master/input/regression/predefined-fretboards.ly']
Interpreting music...
elapsed time: 0.01 seconds
Element count 15 (spanners 5)
Preprocessing graphical objects...
Grob count 21[sans_4.5966796875][sans_3.25][sans_2.318359375]
(process:2929): Pango-WARNING **: Error loading GSUB table 57005
[sans_1.9326171875]GLib: Cannot convert message: Could not open
converter from 'UTF-8' to 'ANSI_X3.4-1968'

(process:2929): Pango-CRITICAL **: No fonts found:
This probably means that the fontconfig
library is not correctly configured. You may need to
edit the fonts.conf configuration file. More information
about fontconfig can be found in the fontconfig(3) manual
page and on http://fontconfig.org

(process:2929): Pango-WARNING **: failed to find shape engine,
expect ugly output. engine-type='PangoRenderFc', script='latin'

(process:2929): Pango-CRITICAL **: pango_fc_font_lock_face:
assertion `PANGO_IS_FC_FONT (font)' failed

gub3.diff
Description: Text document