It may be too late for this, but here goes:In the source package's control file, if you replace the Build-Depends on libssl-dev with:
libssl1.0-dev | libssl-dev (<< 1.1.0~)the package builds and appears to work normally. This is what OpenSSH (and maybe others) used to get past this FTBFS for this transition.
I use this package regularly and hope it makes it into stable Stretch, especially since it seems that Debian can't become OpenSSL 1.1-only in this release cycle.
