gkrellmwireless fails to cross build from source. The immediate problem
is that it doesn't pass cross tools to make. dh_auto_build fixes that,
but the upstream Makefile doesn't pick up $(PKG_CONFIG) and uses the
build architecture pkg-config instead. After fixing that, one notices
that it lost its CFLAGS, because it stuffs the CFLAGS into $(CC), but
dh_auto_build replaces that. Even after fixing that, it continues to
fail while calling install with -s. It uses the wrong strip here, which
not only breaks cross building, but also generation of a -dbgsym package
as well as DEB_BUILD_OPTIONS=nostrip (aka #437038). The attached patch
fixes all of that. Please consider applying it.

Helmut

We believe that the bug you reported is fixed in the latest version of
gkrellmwireless, 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 914827@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Christoph Biedl <debian.axhn@manchmal.in-ulm.de> (supplier of updated gkrellmwireless 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: Tue, 04 Jan 2022 22:04:18 +0100
Source: gkrellmwireless
Architecture: source
Version: 2.0.3-2
Distribution: unstable
Urgency: medium
Maintainer: Christoph Biedl <debian.axhn@manchmal.in-ulm.de>
Changed-By: Christoph Biedl <debian.axhn@manchmal.in-ulm.de>
Closes: 427070 437038 914827 999235 1001972
Changes:
 gkrellmwireless (2.0.3-2) unstable; urgency=medium
 .
   * Take maintainership. Thanks Sjoerd Simons for handing over.
     Closes: #1001972
   * Packaging cleanup. Closes: #437038, #914827, #999235
   * Handle dBm values in /proc/net/wireless. Closes: #427070
Checksums-Sha1:
 ff0c9567c0fc6ccd64dea400838582496ac01760 1774 gkrellmwireless_2.0.3-2.dsc
 c012666d4e7b716b10792d8a530966237b0e30e2 2876 gkrellmwireless_2.0.3-2.debian.tar.xz
 6c4a6445b9e0131f0223caa4ed0780f93abb73a4 11160 gkrellmwireless_2.0.3-2_powerpc.buildinfo
Checksums-Sha256:
 432910840dcda90bd896cfeeff70bce30cafb63f4e1a1e1abb4eb44d9b90b03b 1774 gkrellmwireless_2.0.3-2.dsc
 e2aefb2f2d0b361b96b58f46e4fed82617559bdc3105426f4930c00aecf374a5 2876 gkrellmwireless_2.0.3-2.debian.tar.xz
 54a532b31fbbedcda42f62e4187a7b723b83fe71b76d17b0cf1b674617407281 11160 gkrellmwireless_2.0.3-2_powerpc.buildinfo
Files:
 feb821922012865e036ec7cb4dd35ab4 1774 x11 optional gkrellmwireless_2.0.3-2.dsc
 7dc70e2c631ce6c8ce0680b574d490b8 2876 x11 optional gkrellmwireless_2.0.3-2.debian.tar.xz
 549010296cc3e9d3fdb69d9e90285460 11160 x11 optional gkrellmwireless_2.0.3-2_powerpc.buildinfo
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Control: reopen -1

I think you missed important parts of the patch.

Helmut