autogen.sh instructions suggestion

On Debian sid, with autoconf2.13 and autoconf2.50 installed and apr
checked out in a subdirectory as suggested, it is necessary to set
$AUTOCONF when running autogen.sh. Otherwise the apr subdirectory is
set up using autoconf2.13, and it can fail with errors like this:

    ~/work/subversion/trunk% CC=distcc ./configure --disable-shared
    creating config.nice
    configure: Apache Portable Runtime (APR) library configuration
    checking for APR... reconfig
    configuring package in apr now
    configure: warning: CC=distcc: invalid host type
    loading cache /dev/null
    checking host system type... Invalid configuration `CC=distcc': machine `CC=distcc' not recognized

    checking target system type... Invalid configuration `CC=distcc': machine `CC=distcc' not recognized

    checking build system type... Invalid configuration `CC=distcc': machine `CC=distcc' not recognized

    Configuring APR library
    Platform:
    checking for working mkdir -p... yes
    APR Version: 0.9.2
    checking for chosen layout... apr

Simply invoking this way fixes the problem:

    ~/work/subversion/trunk% AUTOCONF=autoconf2.50 sh ./autogen.sh

I'd like to suggest that in INSTALL (or some other document) you tell
Debian users to do this.

-- 
Martin 
(Please cc me on replies)
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