build error

[mud0107]

Describe the bug
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To Reproduce
Steps to reproduce the behavior:
1.Run'...'
Build: os: mac: 10.15.7, golang: 15.6(15,8)
linux (ubuntu 20.xx), golang 15.6
2. See error

github.com/filecoin-project/lotus/chain/gen

chain/gen/mining.go:154:14: undefined: ffi.CreateZeroSignature
make: *** [lotus] Error 2

Expected behavior
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Screenshots
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Version (run lotus version):

git source last version

Additional context
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[nonsense]

I also have an Ubuntu setup and cannot reproduce your problem.

Did you go through the installation instructions at https://docs.filecoin.io/get-started/lotus/installation/#build-and-install-lotus ?

Could you paste the commands you use to try to build Lotus after you git clone https://github.com/filecoin-project/lotus ?