You should follow below steps :

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cd /usr/local/src
wget http://www.sfr-fresh.com/unix/privat/mod_evasive_1.10.1.tar.gz
tar -zxvf mod_evasive_1.10.1.tar.gz
cd mod_evasive

For apache 2.0.x :

/usr/sbin/apxs -cia mod_evasive20.c //integrating with apache.

Then add these in httpd.conf :
DOSHashTableSize 3097
DOSPageCount 6
DOSSiteCount 100
DOSPageInterval 2
DOSSiteInterval 2
DOSBlockingPeriod 600

For apache 1.3.x :

/usr/local/apache/bin/apxs -cia mod_evasive.c //integrating with apache.

Then add this too httpd.conf
DOSHashTableSize 3097
DOSPageCount 6
DOSSiteCount 100
DOSPageInterval 2
DOSSiteInterval 2
DOSBlockingPeriod 600

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That’s it. Try 🙂