compile mod_security 2.5.11 on RHAT 5.2 and IBM HTTP SERVER 6 (apache 2.0.47)

Hi,
i'm trying to compile mod_security 2.5.11 on a rhat 5.2 server
using IBM http server 6 (based on apache 2.0.47).
My problem is that on file msc_util.c, when compiling, gcc is 
telling me that APR_WSTICKY, APR_GSETID and APR_USETID are undefined.
I've checked and apr-config --version say that i'm using apr 0.9.4
Is my configuration supported or not?
thanks to anyone!

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