[cairo] pc backend files depending on cairo

[Mike Emmel]

Well I just pulled the latest code and I still get this note the
depend on cairo.
Does anyone else see this ?
Is it a autocrap problem if so whats the versions I should be using.

prefix=/home/memmel/Source/Build
exec_prefix=NONE
libdir=${exec_prefix}/lib
includedir=${prefix}/include

Name: xlib
Description: Xlib backend for cairo graphics library
Version: 1.2.1

Requires: cairo
Libs:  -lSM -lICE  -L/home/memmel/Source/Build/lib -lX11
Cflags: -I${includedir}/cairo  -I/home/memmel/Source/Build/include