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I got "Too many open files"
On building mruby with Rake, you may got "Too many open files" error. This is harmless. Please re-run ./minirake (or make).
This issue is reported by mruby/mruby#793.
I got "Don't know how to rake"
Maybe dependencies are corrupt. type
git clean -xdf also effective.
I can't build with Android-NDK on Cygwin.
Building on Cygwin is not well supported, because of the way paths are treated (slash vs. backslash, /cygdrive/c/ vs. C:, etc.) However, some users successfully built under Cygwin.
The key is to set up the NDK environment like so:
export ANDROID_STANDALONE_TOOLCHAIN=\`cygpath -w /tmp/android-14-toolchain\
After this, it should build if you run