could an apache module be gpl ?

[browaeys.alban@wanadoo.fr]

This bug report raised the issue :
http://bugs.debian.org/313615

of an apache module (libapache-mod-security) being gpl while
using apache licenced headers .

I have checked the module source and it does not ship with its
own version of the apache headers. 


It seems to me this is not an issue as modules resolves their
symbols at runtime so the "library" can be bsd or apache licenced
and the module gpl . 

Though this bug report also describe such modules as being
derived works which makes some sense ...


Thank you for any clue on this issue.
Regards
Alban