XAMPP Apache conflicting with OS X Apache

[mmb]

I wanted to install XAMPP to do some local testing but leave my OS X system Apache running.
XAMPP allows to change the port of Apache but the setting is ignored by the startup script that fails.
I'd like to share the problem and the solution I used.

Apache fails to start, Apache's "led" remains red
The application log gives no message
Running by hand

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/Applications/XAMPP/xamppfiles/xampp startapache

you get the error message:
'Another web server is already running.'

The problem is that the script is always looking for port 80, even if I configured XAMPP's apache to use 8280.
A workaround is to stop the system Apache, start XAMPP's Apache, start the system Apache.

XAMPP code should be changed in XAMPP/xamppfiles/xampp startapache, function startApache from:

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        if testport 80


to

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        xampp_http_port=`egrep "^Listen" xamppfiles/etc/httpd.conf | sed 's;[^:]*:;;'`
        if testport $xampp_http_port


I don't know if this is the best way to suggest a code change.
Please advise. Thanks

I'm using XAMPP 1.8.3-1 on OS X 10.6.8