In /Library/LaunchDaemons, add this file as "svn.plst":

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
	<dict>
		<key>Debug</key>
		<false/>
		<key>Disabled</key>
		<false/>
		<key>GroupName</key>
		<string>daemon</string>
		<key>Label</key>
		<string>svn</string>
		<key>OnDeamand</key>
		<true/>
		<key>Program</key>
		<string>/sw/bin/svnserve</string>
		<key>ProgramArguments</key>
		<array>
			<string>svnserve</string>
			<string>--inetd</string>
			<string>--root=/Volumes/data02/svnuser/repo</string>
		</array>
		<key>ServiceDescription</key>
		<string>SVN Code Version Management</string>
		<key>Sockets</key>
		<dict>
			<key>Listeners</key>
			<dict>
				<key>SockFamily</key>
				<string>IPv4</string>
				<key>SockServiceName</key>
				<string>svn</string>
				<key>SockType</key>
				<string>stream</string>
			</dict>
		</dict>
		<key>Umask</key>
		<integer>2</integer>
		<key>UserName</key>
		<string>svnuser</string>
		<key>inetdCompatibility</key>
		<dict>
			<key>Wait</key>
			<false/>
		</dict>
	</dict>
</plist>