build/build-SD-armbian.sh: line 72: docker: command not found

since I don’t see odroidHC1 / HC2 image and didn’t get an answer on my question, if armhf is still supported, I tried building the image my self…

but it failed with the following error:
build/build-SD-armbian.sh: line 72: docker: command not found

enven though, docker is installed.

any ideas?