[cairo] Performance issue with get_text_extents

[Fan Chun-wei]

Hi Robert,

You might want to check whether the source that contains the implementation of Cairo::Device::Device is being compiled in the "cairomm" project-it's complaining as get_device (sorry if I mis-remembered the function) could not get the Cairo::Device::Device constructor implementation/symbol.  It seems that the projects for building cairomm missed that source file, as the linker error seems like it is missing a C++ symbol, not a C symbol (as in Cairo)-so do a search for it and add it into the "cairomm" project.

I remember hitting this when I built cairomm.

Hope this helps.

With blessings,
-Fan, Chun-wei