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1. build library
make -C lib

2. build test
make -C test

3. run test
cd test ; export LD_LIBRARY_PATH=../lib ; ./xxx_test.out

4. build demo
make -C demo

5. run demo
cd demo ; export LD_LIBRARY_PATH=../lib ; ./xxx_demo.out
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how to change backend (fb and x11) ?

1. modify lib/Makefile
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