Bootstrapping is funny that way. Besides the tools in the environment, you've got to have at least 1GB RAM available to build perl6. I can compile it within the Gnuroot Debian app on my Nexus 5, which has 2GB total real ram, so it has enough even inside the Android app. I can't similarly build it on my Nexus 7 or my Galaxy Nexus, they only have 1GB real RAM, so less is available within the app environment.
But I can copy the built perl6 from my N5 to my N7 and my gnex, and it works fine there.