I've tryed it on a very simple makefile and after some testing found what trigger the message. It is simply a line with an "echo" command. It seems that make try to run it with "/bin/sh".
Do you plan to also make a version for 64bit ARM ? This one works perfectly on my Nexus 9 but I would love to be able to develop for ARM64 directly on it.
Thank you for your work, From what I see on the play store, you plan to make money with the extensions ? I will probably buy at least the theme one soon.