You can use -e to check if a file exists. Something like 
if (-e "./log.conf") {

     Log::Log4perl->init("./log.conf");

} elsif (-e "../log.conf") {
 
     Log::Log4perl->init("../log.conf");

} else {

     Log::Log4perl->init("/etc/log.conf");

}

[download]
Code is untested and I've been forced to use ASP for the last month so it could be totally wrong. I'm sure there is a more elegant solution too.

In reply to Re: log4perl: finding initialisation file by xorl
in thread log4perl: finding initialisation file by loris

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