How to : Compile mod_bw for apache server 2.4.x on Centos 6.3/ Fedora / Redhat 6.0/ Ubuntu 12.04

How to Compile mod_bw for apache server 2.4.x on Linux Server.

1 ) Download the mod_bw package from
wget http://bwmod.sourceforge.net/files/mod_bw-0.7.tgz
tar -zxvf mod_bw-0.7.tgz
cd mod_bw

2 ) Open & edit  C program file mod_bw.c

a ) Search “remote_addr” and replace to “client_addr”

b ) That will install the module correctly, but when you add the configuration option to your vhost configs you might get an error "undefined symbol: apr_atomic_cas". When that happens, open the file mod_bw.c and change the following:

Before:

/* Compatibility for ARP < 1 */
#if (APR_MAJOR_VERSION < 1)
    #define apr_atomic_inc32 apr_atomic_inc
    #define apr_atomic_dec32 apr_atomic_dec
    #define apr_atomic_add32 apr_atomic_add
    #define apr_atomic_cas32 apr_atomic_cas
    #define apr_atomic_set32 apr_atomic_set
#endif


AFTER : comment the block.


/* Compatibility for ARP < 1 */
/*
#if (APR_MAJOR_VERSION < 1)
   #define apr_atomic_inc32 apr_atomic_inc
   #define apr_atomic_dec32 apr_atomic_dec
   #define apr_atomic_add32 apr_atomic_add
   #define apr_atomic_cas32 apr_atomic_cas
   #define apr_atomic_set32 apr_atomic_set
#endif
*/

Save & exit.

3 ) Now use apache extension tool for compile mod_bw.c code.

apxs -i -a -c mod_bw.c

Check & verify your httpd.conf files.

4 ) restart Apache Server

apachectl restart