Merge branch 'develop' into macos_ci

diff --cc .github/workflows/testsuite.yml
index e81084811a6e013468294ace9f00fd2b3c959137,74ee2905716d839626678277f5fafdfb1d9f83e5..1b27aba5d83b2793a94cc6f74a167307776d946b
--- 1/.github/workflows/testsuite.yml
--- 2/.github/workflows/testsuite.yml
+++ b/.github/workflows/testsuite.yml
@@@ -33,4 -37,99 +37,96 @@@ jobs
      # macOS’s system OpenSSL (LibreSSL, actually) isn’t meant for linking,
      # and Homebrew’s# OpenSSL isn’t CI-friendly. So build without OpenSSL.
      - run: ./configure --without-ssl --disable-sha2 --disable-gost --disable-ecdsa --disable-dane
 -
 -    # As of now the test suite requires OpenSSL, so no tests.
 -    # cf. https://github.com/NLnetLabs/ldns/issues/162
 -    - run: make
 +    - run: make test
+ 
+   # Pending https://github.com/NLnetLabs/ldns/issues/197,
+   # only builds succeed here.
+   cygwin:
+     name: Cygwin
+ 
+     runs-on: windows-latest
+ 
+     steps:
+       - name: Make git ignore line breaks
+         run: git config --global core.autocrlf false
+       - name: Set up Cygwin
+         uses: cygwin/cygwin-install-action@master
+         with:
+             packages: make gcc-g++ bash libtool automake autoconf libssl-devel bind-utils
+       - uses: actions/checkout@main
+         with:
+           submodules: recursive
+       - shell: C:\cygwin\bin\bash.exe --login --norc -eo pipefail -o igncr '{0}'
+         name: Build
+         run: |
+             cd $GITHUB_WORKSPACE
+             libtoolize -vci
+             autoreconf -vfi
+             ./configure
+             make
+ 
+   qemu-alpine:
+     name: Linux (Alpine, ${{ matrix.platform }})
+ 
+     runs-on: ubuntu-latest
+ 
+     strategy:
+       fail-fast: false
+       matrix:
+         platform:
+           - i386
+           - arm32v6
+           - arm32v7
+           - arm64v8
+           - s390x
+ 
+     steps:
+       - uses: actions/checkout@main
+         with:
+             submodules: recursive
+       - name: Get the qemu container
+         run: docker run --rm --privileged multiarch/qemu-user-static --reset -p yes
+       - name: "${{ matrix.platform }}: Build and test"
+         run: docker run --rm --interactive --mount type=bind,source=$(pwd),target=/host ${{ matrix.platform }}/alpine sh -c "apk add make gcc libc-dev libtool automake autoconf openssl-dev m4 indent bash bind-tools && cd /host && libtoolize -vci && autoreconf -vfi && ./configure && make test"
+ 
+   BSDs:
+     name: ${{ matrix.os.dispname }} ${{ matrix.os.version }}
+ 
+     runs-on: macos-latest
+ 
+     strategy:
+       fail-fast: false
+       matrix:
+         os:
+           - name: freebsd
+             dispname: FreeBSD
+             version: '13.0'
+             pkginstall: pkg install -y libtool automake bind-tools gmake gindent
+             env:
+             configure_args:
+ 
+             # OpenBSD seems to require explicit auto* versions.
+           - name: openbsd
+             dispname: OpenBSD
+             version: '7.1'
+             pkginstall: pkg_add -v libtool gmake gindent automake-1.16.3 autoconf-2.71
+             env: AUTOCONF_VERSION=2.71 AUTOMAKE_VERSION=1.16
+             configure_args: --disable-dane-verify
+ 
+     steps:
+       - uses: actions/checkout@main
+         with:
+           submodules: recursive
+       - name: Build and test on ${{ matrix.os.name }}
+         uses: cross-platform-actions/action@master
+         with:
+           operating_system: ${{ matrix.os.name }}
+           version: ${{ matrix.os.version }}
+           shell: bash
+           run: |
+             export DUMMY12345=1 ${{ matrix.os.env }}
+             sudo ${{ matrix.os.pkginstall }}
+             libtoolize -vci
+             autoreconf -vfi
+             ./configure ${{ matrix.os.configure_args }}
+             gmake test