ERROR: Error installing ffi: ERROR: Failed to build gem native extension

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The gem install ffi fails due to the gem trying to build a bundled copy of libffi, which does not work due to assumptions that /usr/bin/env exists and too old libffi copy.

However, you can build the ffi gem against the system libffi – install the packages:

apt install clang make ruby-dev libffi-dev

After that the ffi gem should build:

gem install ffi

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