Hello!
Here is how I managed to compile align-1.0.4 in a dedicated conda environment:
conda create --name silicosit
# install openbabel from conda, unfortunately, v.2.3.1 is not available, but 2.4.1 is there
conda install -c conda-forge openbabel=2.4.1
# download align-1.0.4, unpack and change dir
mkdir build; cd build
export BABEL_LIBDIR=/path/to/miniconda3/envs/silicosit/lib/
export BABEL_DATADIR=/path/to/miniconda3/envs/silicosit/share/openbabel/2.4.1/
export BABEL_INCLUDEDIR=/path/to/miniconda3/envs/silicosit/include/
cmake ..
# if no errors returned by cmake
cd .. ; make
# check if align-it runs
./align-it -h
I am yet to check the functionality, but at least the compilation worked :)
Good luck!
Vadim