./configure
--enable-milter and make as usual. In order to use the
'-enable-milter' option with 'configure', your system MUST have the milter
library installed. If you use the '-enable-milter' option without the
library being installed, you will most likely see output like this during
'configure':
checking for libiconv_open in -liconv... no
checking for iconv... yes
checking whether in_port_t is defined... yes
checking for in_addr_t definition... yes
checking for mi_stop in -lmilter... no
checking for library containing strlcpy... no
checking for mi_stop in -lmilter... no
configure: error: Cannot find libmilter
At which point the 'configure' script will stop processing.