> When I give command of "make build",
> I got the error (attached tail part of error)
[...]
> echo: I/O error
TL;DR: in your shell, try to run bash (from inside your current shell, so you 
end up with a nested shell) and logout (return back to your original shell), 
then try to compile again.

This kind of errors typically arise when stdout/stderr is set to non-blocking 
I/O, which confuses most shell tools: they get EAGAIN errors they never get 
when set to blocking I/O, which is the default for the shell.
VPP in interactive mode sets stdout/stderr to non-blocking I/O but does not 
restore it at exit. Running bash will restore blocking I/O (bash reinitialize 
I/O settings at init).

ben
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