Instructions for statically compiling mod_limitipconn into httpd:

tar xzvf httpd-2.2.9.tar.gz
tar xjvf mod_limitipconn-0.23.tar.bz2
cd httpd-2.2.9
./configure --with-module=aaa:../mod_limitipconn-0.23/mod_limitipconn.c
make
make install

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Instructions for building as a Dynamic Shared Object (DSO):

tar xjvf mod_limitipconn-0.23.tar.bz2
cd mod_limitipconn-0.23
make install