>>> systemd 243.4 Downloading
--2019-11-30 05:24:19--  https://github.com/systemd/systemd-stable/archive/v243.4/systemd-243.4.tar.gz
Resolving github.com (github.com)... 140.82.118.3
Connecting to github.com (github.com)|140.82.118.3|:443... connected.
HTTP request sent, awaiting response... 302 Found
Location: https://codeload.github.com/systemd/systemd-stable/tar.gz/v243.4 [following]
--2019-11-30 05:24:20--  https://codeload.github.com/systemd/systemd-stable/tar.gz/v243.4
Resolving codeload.github.com (codeload.github.com)... 192.30.253.120
Connecting to codeload.github.com (codeload.github.com)|192.30.253.120|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: unspecified [application/x-gzip]
Saving to: '/home/buildroot/autobuild/run/instance-0/output-1/build/.systemd-243.4.tar.gz.0XFAVl/output'

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2019-11-30 05:24:23 (2.81 MB/s) - '/home/buildroot/autobuild/run/instance-0/output-1/build/.systemd-243.4.tar.gz.0XFAVl/output' saved [8248210]

systemd-243.4.tar.gz: OK (sha256: 281bc47aa6b173c3c6fa1bbc88aea84ecb014313aeb679c54f8885dd09e434be)
>>> systemd 243.4 Extracting
gzip -d -c /home/buildroot/autobuild/run/instance-0/dl/systemd/systemd-243.4.tar.gz | tar --strip-components=1 -C /home/buildroot/autobuild/run/instance-0/output-1/build/systemd-243.4   -xf -
>>> systemd 243.4 Patching

Applying 0001-install-don-t-use-ln-relative.patch using patch: 
patching file meson.build
Hunk #1 succeeded at 581 (offset 1 line).
patching file tools/meson-make-symlink.sh
patching file units/meson-add-wants.sh
>>> systemd 243.4 Configuring
rm -rf /home/buildroot/autobuild/run/instance-0/output-1/build/systemd-243.4//build
mkdir -p /home/buildroot/autobuild/run/instance-0/output-1/build/systemd-243.4//build
sed -e "s%@TARGET_CROSS@%/home/buildroot/autobuild/run/instance-0/output-1/host/bin/sparc64-linux-%g" -e "s%@TARGET_ARCH@%sparc64%g" -e "s%@TARGET_CPU@%ultrasparc%g" -e "s%@TARGET_ENDIAN@%"big"%g" -e "s%@TARGET_CFLAGS@%`printf '"%s", ' -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64  -Os  `%g" -e "s%@TARGET_LDFLAGS@%%g" -e "s%@TARGET_CXXFLAGS@%`printf '"%s", ' -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64  -Os  `%g" -e "s%@HOST_DIR@%/home/buildroot/autobuild/run/instance-0/output-1/host%g"  package/meson/cross-compilation.conf.in > /home/buildroot/autobuild/run/instance-0/output-1/build/systemd-243.4//build/cross-compilation.conf
PATH="/home/buildroot/autobuild/run/instance-0/output-1/host/bin:/home/buildroot/autobuild/run/instance-0/output-1/host/sbin:/usr/local/bin:/usr/bin:/bin:/usr/local/games:/usr/games" LC_ALL=C.UTF-8 PYTHONNOUSERSITE=y /home/buildroot/autobuild/run/instance-0/output-1/host/bin/meson --prefix=/usr --libdir=lib --default-library=shared --buildtype=release --cross-file=/home/buildroot/autobuild/run/instance-0/output-1/build/systemd-243.4//build/cross-compilation.conf -Drootlibdir='/usr/lib' -Dblkid=true -Dman=false -Dima=false -Dldconfig=false -Ddefault-dnssec=no -Ddefault-hierarchy=hybrid -Dtests=false -Dsplit-bin=true -Dsplit-usr=false -Dsystem-uid-max=999 -Dsystem-gid-max=999 -Dtelinit-path=/home/buildroot/autobuild/run/instance-0/output-1/target/sbin/telinit -Dkmod-path=/usr/bin/kmod -Dkexec-path=/usr/sbin/kexec -Dsulogin-path=/usr/sbin/sulogin -Dmount-path=/usr/bin/mount -Dumount-path=/usr/bin/umount -Dnobody-group=nogroup -Didn=true -Dnss-systemd=true -Dacl=false -Daudit=false -Dlibcryptsetup=true -Delfutils=false -Dlibiptc=false -Dlibidn=false -Dlibidn2=false -Dseccomp=false -Dxkbcommon=true -Dbzip2=true -Dlz4=false -Dpam=true -Dvalgrind=false -Dxz=true -Dzlib=true -Dlibcurl=true -Dgcrypt=true -Dpcre2=true -Dmicrohttpd=false -Dqrencode=false -Dremote=false -Dselinux=false -Dhwdb=false -Dbinfmt=true -Dvconsole=true -Dquotacheck=false -Dtmpfiles=true -Dsysusers=false -Dfirstboot=false -Drandomseed=false -Dbacklight=false -Drfkill=false -Dlogind=false -Dmachined=false -Dimportd=false -Dhostnamed=false -Dnss-myhostname=false -Dtimedated=false -Dlocaled=false -Dcoredump=false -Dpstore=false -Dpolkit=false -Dnetworkd=false -Dresolve=true -Dtimesyncd=false -Dsmack=false -Dhibernate=true -Defi=false -Dgnu-efi=false -Dfallback-hostname=buildroot /home/buildroot/autobuild/run/instance-0/output-1/build/systemd-243.4/ /home/buildroot/autobuild/run/instance-0/output-1/build/systemd-243.4//build
The Meson build system
Version: 0.52.0
Source dir: /home/buildroot/autobuild/run/instance-0/output-1/build/systemd-243.4
Build dir: /home/buildroot/autobuild/run/instance-0/output-1/build/systemd-243.4/build
Build type: cross build
Project name: systemd
Project version: 243
C compiler for the build machine: cc (gcc 4.8.2 "cc (Ubuntu 4.8.2-19ubuntu1) 4.8.2")
C linker for the build machine: GNU ld.bfd 2.24
C compiler for the host machine: /home/buildroot/autobuild/run/instance-0/output-1/host/bin/sparc64-linux-gcc (gcc 7.4.0 "sparc64-linux-gcc.br_real (Buildroot 2019.05.1) 7.4.0")
C linker for the host machine: GNU ld.bfd 2.31.1
Build machine cpu family: x86_64
Build machine cpu: x86_64
Host machine cpu family: sparc64
Host machine cpu: ultrasparc
Target machine cpu family: sparc64
Target machine cpu: ultrasparc

meson.build:32:0: ERROR: Program or command 'realpath' not found or not executable

A full log can be found at /home/buildroot/autobuild/run/instance-0/output-1/build/systemd-243.4/build/meson-logs/meson-log.txt
make: *** [/home/buildroot/autobuild/run/instance-0/output-1/build/systemd-243.4/.stamp_configured] Error 1
make: Leaving directory `/home/buildroot/autobuild/run/instance-0/buildroot'