You'd have to download the source rpm (SRPM) to get the source they used. You can either do that, unpack it, and build mod_perl against it, or you can download the apache source, build apache and mod_perl, remove the apache rpm, and install your newly built apache in its place.

In reply to Re^5: mod_perl installation - missing apache src by perrin
in thread mod_perl installation - missing apache src by ARiccela

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