This patch should fix the problem:
http://cgit.freedesktop.org/cairo/commit/?h=1.8&id=7f22d9d433599292d1e9778f29df02dbf6985f6f
This patch should fix the problem:
http:// cgit.freedeskto p.org/cairo/ commit/ ?h=1.8& id=7f22d9d43359 9292d1e9778f29d f02dbf6985f6f