[LAU] problem installing rakarrack-0.2.0 on Ubuntu 8.04

[millward]

There is no package for installing rakarrack on Ubuntu, so I'm using the
old configure, make, make install method and I'm almost finished with
the configure except for one error message.
  configure can't see my Jack files. I've got lots of them installed, but
it says:  
  Package jack was not found in pkg-config search path. Perhaps you
should add the directory containing "jack.pc"  to the
PKG_CONFIG_PATH environment variable.
    I don't have a file called jack.pc anywhere, but I've got lots
of other Jack files. As far as I know everything Jack has already
been installed so I don't know how or where you can even get the
file jack.pc.  The Synaptic package manager shows I've installed
everything Jack and does not list a jack.pc file.
   The command "env" shows no envirnment variable called
PKG_CONFIG_PATH.
   This is rather frustrating. Has anyone any ideas what I can do,
or perhaps, what I've done wrong?