Before doing anything, I advise you to read the README file that comes with the DP distribution. You can also browse the HTML documentation in the doc subdirectory.
You may also want to change the of the DPCONF_DIR and DP_DIR variables in the dp.conf file. For example, My system has them set to DPCONF_DIR=/usr/local/dp/conf and DP_DIR=/usr/local/dp
Make sure that you have /usr/ccs/bin before whereever you have GNU-make in your PATH variable.
The DP installation process modifies the root crontab entries. You may wish to save your original crontab file by using the command crontab -l > /tmp/root.crontab.orig so that you can recover from any accidents.
If you are using the GNU C compiler, alter Makefile.conf to use gcc instead of cc
Once you have fixed up the config and make files, you should be able to make the DP file as per the instructions in the README file. You will need to be root to perform the install actions. Once you have finished, you should be ready to start configuration.