Cross compilation error

[Jonathan Tremesaygues <jonathan.tremesaygues@sereema.com>]

Hi,

I’m using Debian Buster amd64 and I try to cross-compile ppp for armhf.

I never cross-compiled before so I have followed this guide: 
https://wiki.debian.org/CrossCompiling#Building_with_dpkg-buildpackage

A paste of my actions is available here: http://paste.debian.net/1201433/

If I understand the error, the compiler search for the amd64 version of 
the libssl-dev’s headers instead of the armhf one. But I don’t 
understand why. Any idea or clue?

Best regards,

Jonathan T.