well, I just followed the how-to-build.txt and the main problems seems to be in freetype. I compiled harfbuzz and copied that into jni/harfbuzz-ng folder,it's fine .

when compiling the freetype ,it first tells me that png.h not found,I installed libpng-dev and it starts to give me some other errors instead.

just can't get it done.

please help me ...