I haven't received any response to this request to apply a specific fix.  Is there a bug reporting system for stunnel?  If so, I would prefer to file a bug report.

On Sun, Apr 29, 2018 at 4:43 PM, Joe Harvell <joe.harvell.x@gmail.com> wrote:
The src/Makefile.am hardcodes -I/usr/kerberos/include.  When cross compiling it should be including -I$(SYSROOT)//usr/kerberos/include.

I patched configure.ac and Makefile.am, taking advantage of the existing  --with-sysroot configure option.

The Gentoo bug report: https://bugs.gentoo.org/654374

I was unable to find a bug reporting system for stunnel.  So I guess this is it.  Please source this fix.

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Joe Harvell