[vbox-dev] VirtualBox 6.1.97 r138981 for Linux 64-bit fails to build module on Ubuntu MATE 20.04

[Valdis Kl=?utf-8?Q?=c4=93?=tnieks]

On Tue, 14 Jul 2020 23:09:52 -0000, Jags Desai said:

> VirtualBox 6.1.97 r138981 for Linux 64-bit fails to build module on Ubuntu
> MATE 20.04
>
> Attaching vbox install and setup logs.
>
> Previous development version VirtualBox-6.1.97-138534-Linux_amd64 is
> working just fine.

> /bin/sh: 1: flex: not found

> /bin/sh: 1: bison: not found

This smells suspiciously like either a bad system clock on the build machine or
a duff timestamp on the lexer.l and/or parser.y files causing 'make' to want to
re-make the associated C output files.

Can you check the date/time on the machine for sanity, and look at what
the dates on the files are?  Also, if NFS is involved, check for time slew between
the NFS server and the build machine, etc...
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