configure: error: libdb_cxx headers missing, Datacoin Core requires this library for wallet functionality (--disable-wallet to disable wallet functionality)
You're missing the Berkeley DB packages.
Unix Build Notes
I did everything as stated in the instructions, but at the stage of make I have an error.
distro: Linux Ubuntu 18.04.3 LTS
Code:
sudo apt-get install libboost-all-dev
sudo apt-get install libgmp-dev
sudo apt-get install libczmq-dev
sudo apt-get install libgmp-dev
sudo apt-get install libczmq-dev