Subversion clients wait for post-commit to finish

        I have a post-commit hook script that fires up
an automatic compilation. The problem is that when
a client (TortoiseSVN on Windows or Subversion on Linux)
do a commit, the client waits for the post-commit to
finish. I even put the compilation process in the background
(e.g. compile_project&). It still waits for the process
to finish. How can I get around that? The compilation
process takes a while. I tried using bash's 'disown'
function but that doesn't help either.
        To duplicate a problem, put 'sleep 20' in your
post-commit hook script. Then do a commit. The commit
will hang for 20 seconds on 'Transmitting file data .'
step.
        I run Subversion 1.3 on Apache 2.0.55 on Slackware
10.2.
        I appreciate any help.

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Artur Kedzierski