Hi!

I try to test the new notebook (see #11080). Unfortunately, it fails
to build.

According to the comments on the ticket, the development headers for
openssl are missing, and they could be installed by Ubuntu's libssl-
dev.

However, I am not root for the machine in my office, and the sysadmin
will not be available till tomorrow.

That makes me wonder:
 * How could I install the development headers, myself?
 * Note that installing the optional openssl spkg does not solve the
problem. It puts many headers into SAGE_ROOT/local/include/openssl/,
but apparently these aren't good enough for the new notebook spkg. Can
one modify the openssl spkg such that the missing stuff for the
notebook spkg is installed? How?

And more generally:
 * Do we really want that the libssl development headers will be an
additional dependency for Sage?

On the ticket, Dima claims that this is a trivial problem, since any
modern Linux has openssl. But I think he is mistaken: There is openssl
on my machine, but this is not enough.

>From my perspective, getting the development headers (in addition to
openssl) is non-trivial. And I think it would be a bad idea to have it
as a dependency. To the very least, Sage should offer an optional spkg
that provides the missing stuff for the notebook (it can't be
standard, for licensing, as I was told).

What do you think?
Cheers,
Simon

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