Define your own basis set
Example of basis format (6-31G basis):
**** H 1 0 S 4 2 18.73113700 2.82539370 0.64012170 0.16127780 0.03349460 0.00000000 0.23472695 0.00000000 0.81375733 0.00000000 0.00000000 1.00000000 **** Li 3 1 S 10 3 642.41892000 96.79851500 22.09112100 6.20107030 1.93511770 0.63673580 2.32491840 0.63243060 0.07905340 0.03596200 0.00214260 0.00000000 0.00000000 ...
To use your own basis that is not included in the bdf-pkg/basis_library, you can create a file XXX containing your basis in the same directory of the input and run script , and then you can just specify the basis in COMPASS like the normal basis by the name XXX.
Download basis set from EMSL basis set exchange and convert to BDF basis set format
You can download basis set from EMSL basis set exchange (https://www.basissetexchange.org/). You should output basis set as Gaussian 94 format and save it in a file. Then you can use a small garget named "convert_basis.py" in source/tools directory to convert basis set into BDF internal format.
$ convert_basis.py -f bdf input > output