Hey all,

I'm exploring serialization libraries, so I installed the Python lib and 
got the following error

ImportError: [...]capnp.cpython-38-x86_64-linux-gnu.so: undefined symbol: 
_ZN2kj1_24TransformPromiseNodeBase7onReadyERNS0_5EventE

Which is definitely a thing, and has been for two years: 
https://github.com/capnproto/capnproto/blame/master/c%2B%2B/src/kj/async-inl.h#L392

It also seems to be linked correctly

$ ldd [...]capnp.cpython-38-x86_64-linux-gnu.so
    linux-vdso.so.1 (0x00007ffe675cf000)
    libcapnpc-0.7.0.so => /usr/lib/libcapnpc-0.7.0.so (0x00007f7dc5173000)
    libcapnp-rpc-0.7.0.so => /usr/lib/libcapnp-rpc-0.7.0.so (
0x00007f7dc5090000)
    libcapnp-0.7.0.so => /usr/lib/libcapnp-0.7.0.so (0x00007f7dc4ff4000)
    libkj-async-0.7.0.so => /usr/lib/libkj-async-0.7.0.so (
0x00007f7dc4f60000)
    libkj-0.7.0.so => /usr/lib/libkj-0.7.0.so (0x00007f7dc4eda000)
    libstdc++.so.6 => /usr/lib/libstdc++.so.6 (0x00007f7dc4cf0000)
    libgcc_s.so.1 => /usr/lib/libgcc_s.so.1 (0x00007f7dc4cd4000)
    libc.so.6 => /usr/lib/libc.so.6 (0x00007f7dc4b0d000)
    libpthread.so.0 => /usr/lib/libpthread.so.0 (0x00007f7dc4aeb000)
    libm.so.6 => /usr/lib/libm.so.6 (0x00007f7dc49a5000)
    /usr/lib64/ld-linux-x86-64.so.2 (0x00007f7dc540e000)


So the system library version is 0.7, and the latest Python library is 
0.6.4, not sure if the versions are just mismatched somehow.
I tried installing from git with the same result, is the Python library 
just outdated?
Or maybe the Arch package is just broken, because it doesn't contain the 
required symbol?

Cheers,
Pepijn

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