=> Bootstrap dependency digest>=20010302: found digest-20190127
=> Checksum SHA1 OK for gprolog-1.4.5.tar.gz
=> Checksum RMD160 OK for gprolog-1.4.5.tar.gz
=> Checksum SHA512 OK for gprolog-1.4.5.tar.gz
===> Installing dependencies for gprolog-1.4.5
=> Tool dependency nbpatch-[0-9]*: found nbpatch-20151107
=> Tool dependency checkperms>=1.1: found checkperms-1.12
=> Build dependency cwrappers>=20150314: found cwrappers-20180325
===> Skipping vulnerability checks.
WARNING: No /opt/pkg/pkgdb/pkg-vulnerabilities file found.
WARNING: To fix run: `/opt/pkg/sbin/pkg_admin -K /opt/pkg/pkgdb fetch-pkg-vulnerabilities'.
===> Overriding tools for gprolog-1.4.5
===> Extracting for gprolog-1.4.5
===> Patching for gprolog-1.4.5
=> Applying pkgsrc patches for gprolog-1.4.5
=> Verifying /opt/pkgsrc/lang/gprolog/patches/patch-src_EnginePl_dl__malloc.c
=> Applying pkgsrc patch /opt/pkgsrc/lang/gprolog/patches/patch-src_EnginePl_dl__malloc.c
Hmm...  Looks like a unified diff to me...
The text leading up to this was:
--------------------------
|$NetBSD: patch-src_EnginePl_dl__malloc.c,v 1.1 2019/06/14 17:30:13 maya Exp $
|
|(from editors/emacs20):
|Work around bug in gcc 5.x that makes calloc into a call to itself,
|resulting in an infinite loop.
|
|--- src/EnginePl/dl_malloc.c.orig	2013-04-15 07:24:10.000000000 +0000
|+++ src/EnginePl/dl_malloc.c
--------------------------
Patching file src/EnginePl/dl_malloc.c using Plan A...
Hunk #1 succeeded at 4773.
done
=> Verifying /opt/pkgsrc/lang/gprolog/patches/patch-src_Ma2Asm_powerpc__any.c
=> Applying pkgsrc patch /opt/pkgsrc/lang/gprolog/patches/patch-src_Ma2Asm_powerpc__any.c
Hmm...  Looks like a unified diff to me...
The text leading up to this was:
--------------------------
|$NetBSD: patch-src_Ma2Asm_powerpc__any.c,v 1.1 2020/12/12 02:01:57 gutteridge Exp $
|
|Fix PowerPC build.
|
|--- src/Ma2Asm/powerpc_any.c.orig	2015-01-13 18:00:19.000000000 +0000
|+++ src/Ma2Asm/powerpc_any.c
--------------------------
Patching file src/Ma2Asm/powerpc_any.c using Plan A...
Hunk #1 succeeded at 1011.
done
===> Creating toolchain wrappers for gprolog-1.4.5
===> Configuring for gprolog-1.4.5
=> Modifying GNU configure scripts to avoid --recheck
=> Replacing config-guess with pkgsrc versions
=> Replacing config-sub with pkgsrc versions
=> Replacing install-sh with pkgsrc version
=> Checking for portability problems in extracted files
checking for aarch64-apple-darwin20-gcc... clang
checking whether the C compiler works... yes
checking for C compiler default output file name... a.out
checking for suffix of executables... 
checking whether we are cross compiling... no
checking for suffix of object files... o
checking whether we are using the GNU C compiler... yes
checking whether clang accepts -g... yes
checking for clang option to accept ISO C89... none needed
checking build system type... aarch64-apple-darwin20
checking host system type... aarch64-apple-darwin20
checking for aarch64-apple-darwin20-as... no
checking for as... as
checking for aarch64-apple-darwin20-ranlib... no
checking for ranlib... ranlib
checking for aarch64-apple-darwin20-windres... no
checking for windres... no
checking for aarch64-apple-darwin20-ar... no
checking for ar... ar
checking for aarch64-apple-darwin20-strip... no
checking for strip... strip
checking whether make sets $(MAKE)... yes
checking for a BSD-compatible install... /usr/bin/install -c -o sjmulder -g staff
checking whether ln -s works... yes
configure: error: unsupported architecture aarch64-apple-darwin20
*** Error code 1

Stop.
bmake[1]: stopped in /opt/pkgsrc/lang/gprolog
*** Error code 1

Stop.
bmake: stopped in /opt/pkgsrc/lang/gprolog