>>> systemd 244.1 Extracting
gzip -d -c /home/buildroot/autobuild/run/instance-0/dl/systemd/systemd-244.1.tar.gz | tar --strip-components=1 -C /home/buildroot/autobuild/run/instance-0/output-1/build/systemd-244.1   -xf -
>>> systemd 244.1 Patching

Applying 0001-install-don-t-use-ln-relative.patch using patch: 
patching file meson.build
patching file tools/meson-make-symlink.sh
patching file units/meson-add-wants.sh
>>> systemd 244.1 Configuring
rm -rf /home/buildroot/autobuild/run/instance-0/output-1/build/systemd-244.1//build
mkdir -p /home/buildroot/autobuild/run/instance-0/output-1/build/systemd-244.1//build
sed -e "s%@TARGET_CROSS@%/home/buildroot/autobuild/run/instance-0/output-1/host/bin/mips64el-linux-%g" -e "s%@TARGET_ARCH@%mips64%g" -e "s%@TARGET_CPU@%%g" -e "s%@TARGET_ENDIAN@%"little"%g" -e "s%@TARGET_CFLAGS@%`printf '"%s", ' -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64  -Os  -D_FORTIFY_SOURCE=1`%g" -e "s%@TARGET_LDFLAGS@%%g" -e "s%@TARGET_CXXFLAGS@%`printf '"%s", ' -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64  -Os  -D_FORTIFY_SOURCE=1`%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-244.1//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-244.1//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=true -Daudit=false -Dlibcryptsetup=false -Delfutils=true -Dlibiptc=true -Dlibidn=false -Dlibidn2=false -Dseccomp=false -Dxkbcommon=false -Dbzip2=true -Dlz4=true -Dpam=true -Dvalgrind=false -Dxz=true -Dzlib=true -Dlibcurl=true -Dgcrypt=true -Dpcre2=false -Dmicrohttpd=false -Dqrencode=false -Dremote=false -Dselinux=false -Dhwdb=true -Dbinfmt=false -Dvconsole=false -Dquotacheck=true -Dtmpfiles=false -Dsysusers=false -Dfirstboot=true -Drandomseed=true -Dbacklight=false -Drfkill=false -Dlogind=false -Dmachined=false -Dimportd=true -Dhostnamed=false -Dnss-myhostname=false -Dtimedated=false -Dlocaled=true -Dcoredump=true -Dpstore=false -Dpolkit=false -Dnetworkd=false -Dresolve=false -Dtimesyncd=true -Dsmack=false -Dhibernate=false -Defi=false -Dgnu-efi=false -Dfallback-hostname=buildroot /home/buildroot/autobuild/run/instance-0/output-1/build/systemd-244.1/ /home/buildroot/autobuild/run/instance-0/output-1/build/systemd-244.1//build
The Meson build system
Version: 0.52.1
Source dir: /home/buildroot/autobuild/run/instance-0/output-1/build/systemd-244.1
Build dir: /home/buildroot/autobuild/run/instance-0/output-1/build/systemd-244.1/build
Build type: cross build
Project name: systemd
Project version: 244
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/mips64el-linux-gcc (gcc 7.4.0 "mips64el-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: mips64
Host machine cpu: 
Target machine cpu family: mips64
Target machine cpu: 

meson.build:33:0: 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-244.1/build/meson-logs/meson-log.txt
make: *** [/home/buildroot/autobuild/run/instance-0/output-1/build/systemd-244.1/.stamp_configured] Error 1
make: Leaving directory `/home/buildroot/autobuild/run/instance-0/buildroot'