Error in building ndk library

I have an android project with a native part. Now I am trying to make eclipse compile all things but during the native compilation it gives me this error: ``` sh ndk-build all ERROR: You are using a non-Cygwin compatible Make program. Currently using: C:/cygwin/bin/make To solve the issue, follow these steps: 1. Ensure that the Cygwin 'make' package is installed. NOTE: You will need GNU Make 3.81 or later! 2. Define the GNUMAKE environment variable to point to it, as in: export GNUMAKE=/usr/bin/make 3. Call 'ndk-build' again. ``` Now I can compile it from Cygwin and it works. It also works from eclipse in my other computer with exactly the same paths. I found that if I launch `ndk-build` from cygwin it is all right but if I launch "sh ndk-build" it gives me the error of eclipse. I think this is the problem, but I do not know why prepending the command with `sh` it does not work (also prepending it with bash gives me the error ). Someone can help? Thank you in advance.