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Add fix for cmake in cmake-dateflow example
Under Ubuntu 20.04 in examples/cmake-dataflow and after running make install command there are some errors saying undefined reference , for example
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/home/demo/.cargo/registry/src/index.crates.io-6f17d22bba15001f/nix-0.26.4/src/sys/mman.rs:580: undefined reference to `shm_open'
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The fix was found by RuPingCen by adding a few missing libraries. Verified works.
This is related to #486, right?