Please follow the procedure given below to install and configure  mod_evasive in  cPanel server with apache 2.2.

Download the   latest source file from http://www.zdziarski.com

# cd /usr/local/src/
# wget /blog/wp-content/uploads/2010/02/mod_evasive_1.10.1.tar.gz
# tar -xvzf mod_evasive_1.10.1.tar.gz
# cd mod_evasive/
# /usr/local/apache/bin/apxs -cia mod_evasive20.c

Now create a file named  /usr/local/apache/conf/mod_evasive.conf and add the following lines

# cat /usr/local/apache/conf/mod_evasive.conf
LoadModule evasive20_module   modules/mod_evasive20.so
<IfModule mod_evasive20.c>
DOSHashTableSize    3097
DOSPageCount        2
DOSSiteCount        50
DOSPageInterval     1
DOSSiteInterval     1
DOSBlockingPeriod   10
</IfModule>

Now include the above file inside  /usr/local/apache/conf/includes/pre_main_global.conf

Include "/usr/local/apache/conf/mod_evasive.conf"

Now rebuild httpd.conf

/scripts/rebuildhttpdconf

Now restart apache

/scripts/restartsrv httpd