Instructions for statically compiling mod_limitipconn into httpd:

tar xavf httpd-2.4.2.tar.bz2
tar xavf mod_limitipconn-0.24.tar.bz2
cd httpd-2.4.2
./configure --with-module=aaa:../mod_limitipconn-0.24/mod_limitipconn.c
make
make install

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

tar xavf mod_limitipconn-0.24.tar.bz2
cd mod_limitipconn-0.24
make install