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To build httpd-2.2.x from its sources see ASF httpd doc
If needed, patch the httpd-2.2.x sources with (The patch prevents long waiting time when the node IP can't be resolved that should not happen so you can skip the patch part if you don't want to rebuild httpd). mod_proxy_ajp.patch
(cd modules/proxy patch -p0 < $location/mod_proxy_ajp.patch )
Configure httpd with something like:
./configure --prefix=apache_installation_directory \ --with-mpm=worker \ --enable-mods-shared=most \ --enable-maintainer-mode \ --with-expat=builtin \ --enable-ssl \ --enable-proxy \ --enable-proxy-http \ --enable-proxy-ajp \ --disable-proxy-balancer
Rebuild (make) and reinstall (make install) after that.
You need an httpd installation with mod_proxy (--enable-proxy) and ajp protocol (--enable-proxy-ajp) enabled and with dso enabled (--enable-so)
Download the mod_cluster sources:
git clone git://github.com/modcluster/mod_cluster.git
Build the mod_cluster modules components, for each subdirectory advertise, mod_manager, mod_proxy_cluster and mod_slotmem do something like:
sh buildconf ./configure --with-apxs=apxs_file_location make cp *.so apache_installation_directory/modules
Where apache_installation_directory is the location of an installed version of httpd-2-2.x.
NOTE: You can ignore the libtool message on most platform:
libtool: install: warning: remember to run `libtool --finish apache_installation_directory/modules'
Once that is done use Apache httpd configuration to configure mod_cluster.