sslsplit fails to cross build from source for two reasons. For one thing
it uses the non-standard variable PKGCONFIG for pkg-config.
dh_auto_build substitutes PKG_CONFIG. Therefore, sslsplit does not use
pkg-config and sneaks in a -lz flags. Then make install also needs
access to build tools, but dh_auto_install does not pass them there.
Exporting them from dpkg's buildtools.mk helps here. Please consider
applying the attached patch to make sslsplit cross buildable.

Helmut

We believe that the bug you reported is fixed in the latest version of
sslsplit, which is due to be installed in the Debian FTP archive.

A summary of the changes between this version and the previous one is
attached.

Thank you for reporting the bug, which will now be closed.  If you
have further comments please address them to 958137@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Hilko Bengen <bengen@debian.org> (supplier of updated sslsplit package)

(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing ftpmaster@ftp-master.debian.org)
Format: 1.8
Date: Mon, 01 Jun 2026 00:17:28 +0200
Source: sslsplit
Architecture: source
Version: 0.5.5-3
Distribution: unstable
Urgency: medium
Maintainer: Hilko Bengen <bengen@debian.org>
Changed-By: Hilko Bengen <bengen@debian.org>
Closes: 958137 1138329
Changes:
 sslsplit (0.5.5-3) unstable; urgency=medium
 .
   [ Debian Janitor ]
   * Use secure URI in Homepage field.
   * Bump debhelper from old 11 to 13.
   * Set debhelper-compat version in Build-Depends.
   * Set upstream metadata fields: Repository-Browse.
   * Set upstream metadata fields: Bug-Database, Bug-Submit, Security-Contact.
 .
   [ Hilko Bengen ]
   * Fix FTCBFS, thanks to Helmut Grohne (Closes: #958137)
   * Add patch to fix OpenSSL 4 FTBFS (Closes: #1138329)
   * Replace obsolete pkg-config build-dependency
   * Bump debian/watch version
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