Try to build gpointing-device-settings in pbuilder 32bits powerpc.The repository has some missing packages:
Err http://ftp.ports.debian.org/debian-ports sid/main powerpc libtdb1 powerpc 1.3.18-2 404 Not Found [IP: 2001:67c:2564:a119::77 80] Err http://ftp.ports.debian.org/debian-ports sid/main powerpc libgail18 powerpc 2.24.32-3 404 Not Found [IP: 2001:67c:2564:a119::77 80] Err http://ftp.ports.debian.org/debian-ports sid/main powerpc libgail-common powerpc 2.24.32-3 404 Not Found [IP: 2001:67c:2564:a119::77 80] Err http://ftp.ports.debian.org/debian-ports sid/main powerpc libgail-dev powerpc 2.24.32-3 404 Not Found [IP: 2001:67c:2564:a119::77 80] Err http://ftp.ports.debian.org/debian-ports sid/main powerpc libunbound8 powerpc 1.9.3-1 404 Not Found [IP: 2001:67c:2564:a119::77 80] Err http://ftp.ports.debian.org/debian-ports sid/main powerpc libidn2-dev powerpc 2.2.0-1 404 Not Found [IP: 2001:67c:2564:a119::77 80] Err http://ftp.ports.debian.org/debian-ports sid/main powerpc libp11-kit-dev powerpc 0.23.16.1-2 404 Not Found [IP: 2001:67c:2564:a119::77 80] Err http://ftp.ports.debian.org/debian-ports sid/main powerpc libtasn1-6-dev powerpc 4.14-2 404 Not Found [IP: 2001:67c:2564:a119::77 80] Err http://ftp.ports.debian.org/debian-ports sid/main powerpc nettle-dev powerpc 3.4.1-1 404 Not Found [IP: 2001:67c:2564:a119::77 80] 98% [Working]E: Failed to fetch http://ftp.ports.debian.org/debian-ports/pool-powerpc/main/t/tdb/libtdb1_1.3.18-2_powerpc.deb: 404 Not Found [IP: 2001:67c:2564:a119::77 80] E: Unable to fetch some packages; try '-o APT::Get::Fix-Missing=true' to continue with missing packages
