Comment 1 for bug 1186414

just writing to indicate that the 17 fonts that fail are not outline fonts. They return 0 from the call to IsOutlineFont() in the routine font_instance::InstallFace in the file FontInstance.cpp. They are subsequently replaced with the font 'sans-serif' in line 987 of the file FontFactory.cpp. See the line that says:
PANGO_DEBUG("falling back from %s to 'sans-serif' because InstallFace failed\n",tc);

For these 17 fonts the warning messages are justified; for the other fonts, not.