I googled quickly libsmbclient-dev jaunty, went to the deb download site for jaunty. It gives a list of mirrors.
FYI - the download page for jaunty -
http://packages.ubuntu.com/jaunty/i386/l...v/download
From the above link you can dwnld and install the deb package yourself OR you can let APT install and set it up for you as I explain below.
first add this to your sources.list (Aug 23,09 EDIT - sources.list is in /etc/apt directory, edit using vi, vim, gedit or your one of choice)
deb
http://mirrors.kernel.org/ubuntu jaunty main
save your edited sources.list file.
issue a sudo apt-get update
issue a sudo apt-get install libsmbclient-dev
it will install a few updates with it and stops and restarts a few services and updates glibc at the same time.
Then remove the above deb line from your /etc/apt/sources.list and save the file, if you do not remove the line ubuntu will try and update everything in your 8.10 build.
Works for me, I have updated and built two svn's since do a reboot of your system when completed, i had 100% cpu usage on both cores and free mem was running wild, upon reboot I had normal readings.
Dave