Here are some partial answers, taken from #11080:

 * The optional openssl spkg does install the development headers.
 * The new sagenb spkg contains pyOpenSSL as a sub-package (which
should be fine, since PyOpenSSL's licence APL2 seems to be compatible
with GPL).
 * The new sagenb spkg installs pyOpenSSL with easy_install, but it
does not indicate where to look for the headers. I added a
C_INCLUDE_PATH variable to sagenb's spkg-install, and that seems to
solve the problem.

Conclusion: It is not needed to have the system-wide libssl dev
headers as a dependency. If the headers are missing, we could suggest
that the user installs the optional openssl spkg and then types "make"
again.

Cheers,
Simon

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