Thank you very much jcb!

$ENV{LD_LIBRARY_PATH} = '/opt/lampp/lib:/opt/lampp/lib';

was the result when executed via browser and was empty on command line.

I do not really understand what happened but probably LD_LIBRARY_PATH is checked first and is as you said pointing to a non fitting version and stops after failure.
Not sure if the solution is the best but trying

my $ret = `unset LD_LIBRARY_PATH && $command 2&>1`;

did the trick. You made my day, thank you very much again!

In reply to Re^2: running a backticks command behaves different in command line and browser by derion
in thread running a backticks command behaves different in command line and browser by derion

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