Instructions for statically compiling mod_limitipconn into httpd:

tar xzvf httpd-2.0.39.tar.gz
tar xzvf mod_limitipconn-0.22.tar.gz
cd httpd-2.0.39
./configure --with-module=aaa:../mod_limitipconn-0.22/mod_limitipconn.c
make
make install

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

tar xzvf mod_limitipconn-0.22.tar.gz
cd mod_limitipconn-0.22
make install

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Instructions for building static httpd with proxy tracking:

tar xzvf httpd-2.0.39.tar.gz
tar xzvf mod_limitipconn-0.22.tar.gz
cd httpd-2.0.39
patch -p1 < ../mod_limitipconn-0.22/apachesrc.diff
./buildconf
./configure --enable-forward --with-module=aaa:../mod_limitipconn-0.22/mod_limitipconn.c
make
make install

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Instructions for building DSO with proxy tracking:

tar xzvf httpd-2.0.39.tar.gz
tar xzvf mod_limitipconn-0.22.tar.gz
cd httpd-2.0.39
patch -p1 < ../mod_limitipconn-0.22/apachesrc.diff
./buildconf
./configure --enable-forward
make
make install
cd ../mod_limitipconn-0.22
PATH=/usr/local/apache2/bin:$PATH make install