SNMP++, AGENT++, and AgentX++ require autoconf version 2.64 or higher. Version 2.69 is recommended. If your system does not provide version 2.69 out of the box, you can install it used the following steps.
Install autoconf 2.69
wget http://ftp.gnu.org/gnu/autoconf/autoconf-2.69.tar.gz tar xvfvz autoconf-2.69.tar.gz cd autoconf-2.69 ./configure make sudo make install