The librsvg build reports:
/usr/local/lib/libpangoft2-1.0.so: undefined reference to `hb_ft_face_create’
/usr/local/lib/libpangoft2-1.0.so: undefined reference to `hb_ft_face_create_cached’
collect2: error: ld returned 1 exit status
This appears to be the result of a pango build problem.
Fixed in build #149.