Ubuntu 16.04 compilation errors relating to pangocairo

This is without gdk-2.0

I had to add the following to the Makefile

```
CFLAGS+=`pkg-config --cflags pangocairo`
LDFLAGS+=`pkg-config --libs pangocairo`
```

Otherwise, was getting the error `cairo.h: No such file or directory` on make install.

Relatively fresh install, but I don't know if this a general issue.
