>>> wayland 1.18.0 Extracting
xzcat /home/buildroot/autobuild/instance-3/dl/wayland/wayland-1.18.0.tar.xz | tar --strip-components=1 -C /home/buildroot/autobuild/instance-3/output-1/build/wayland-1.18.0   -xf -
>>> wayland 1.18.0 Patching

Applying 0001-build-add-option-to-disable-tests.patch using patch: 
patching file Makefile.am
patching file configure.ac
patching file meson.build
patching file meson_options.txt
>>> wayland 1.18.0 Configuring
rm -rf /home/buildroot/autobuild/instance-3/output-1/build/wayland-1.18.0//build
mkdir -p /home/buildroot/autobuild/instance-3/output-1/build/wayland-1.18.0//build
sed -e 's%@TARGET_CROSS@%/home/buildroot/autobuild/instance-3/output-1/host/bin/microblazeel-buildroot-linux-uclibc-%g' -e 's%@TARGET_ARCH@%microblazeel%g' -e 's%@TARGET_CPU@%%g' -e 's%@TARGET_ENDIAN@%little%g' -e 's%@TARGET_CFLAGS@%"-D_LARGEFILE_SOURCE", "-D_LARGEFILE64_SOURCE", "-D_FILE_OFFSET_BITS=64", "-Os"%g' -e 's%@TARGET_LDFLAGS@%%g' -e 's%@TARGET_CXXFLAGS@%"-D_LARGEFILE_SOURCE", "-D_LARGEFILE64_SOURCE", "-D_FILE_OFFSET_BITS=64", "-Os"%g' -e 's%@HOST_DIR@%/home/buildroot/autobuild/instance-3/output-1/host%g' -e 's%@STAGING_DIR@%/home/buildroot/autobuild/instance-3/output-1/host/microblazeel-buildroot-linux-uclibc/sysroot%g' -e 's%@STATIC@%false%g' -e "/^\[binaries\]$/s:$::" -e "/^\[properties\]$/s:$::" package/meson/cross-compilation.conf.in > /home/buildroot/autobuild/instance-3/output-1/build/wayland-1.18.0//build/cross-compilation.conf
PATH="/home/buildroot/autobuild/instance-3/output-1/host/bin:/home/buildroot/autobuild/instance-3/output-1/host/sbin:/usr/local/bin:/usr/bin:/bin:/usr/local/games:/usr/games:/home/buildroot/.local/bin:/home/buildroot/.local/bin"  PYTHONNOUSERSITE=y /home/buildroot/autobuild/instance-3/output-1/host/bin/meson --prefix=/usr --libdir=lib --default-library=shared --buildtype=release --cross-file=/home/buildroot/autobuild/instance-3/output-1/build/wayland-1.18.0//build/cross-compilation.conf -Dbuild.pkg_config_path=/home/buildroot/autobuild/instance-3/output-1/host/lib/pkgconfig -Dtests=false -Ddocumentation=false /home/buildroot/autobuild/instance-3/output-1/build/wayland-1.18.0/ /home/buildroot/autobuild/instance-3/output-1/build/wayland-1.18.0//build
WARNING: Unknown CPU family microblazeel, please report this at https://github.com/mesonbuild/meson/issues/new
The Meson build system
Version: 0.54.2
Source dir: /home/buildroot/autobuild/instance-3/output-1/build/wayland-1.18.0
Build dir: /home/buildroot/autobuild/instance-3/output-1/build/wayland-1.18.0/build
Build type: cross build
Project name: wayland
Project version: 1.18.0
C compiler for the build machine: cc (gcc 6.3.0 "cc (Debian 6.3.0-18+deb9u1) 6.3.0 20170516")
C linker for the build machine: cc ld.bfd 2.28
C++ compiler for the build machine: c++ (gcc 6.3.0 "c++ (Debian 6.3.0-18+deb9u1) 6.3.0 20170516")
C++ linker for the build machine: c++ ld.bfd 2.28
C compiler for the host machine: /home/buildroot/autobuild/instance-3/output-1/host/bin/microblazeel-buildroot-linux-uclibc-gcc (gcc 9.3.0 "microblazeel-buildroot-linux-uclibc-gcc.br_real (Buildroot 2020.08-git-05604-g7f54bfc169) 9.3.0")
C linker for the host machine: /home/buildroot/autobuild/instance-3/output-1/host/bin/microblazeel-buildroot-linux-uclibc-gcc ld.bfd 2.33.1

../output-1/build/wayland-1.18.0/meson.build:1:0: ERROR: Unknown compiler(s): [['/home/buildroot/autobuild/instance-3/output-1/host/bin/microblazeel-buildroot-linux-uclibc-g++']]
The follow exceptions were encountered:
Running "/home/buildroot/autobuild/instance-3/output-1/host/bin/microblazeel-buildroot-linux-uclibc-g++ --version" gave "[Errno 2] No such file or directory: '/home/buildroot/autobuild/instance-3/output-1/host/bin/microblazeel-buildroot-linux-uclibc-g++'"

A full log can be found at /home/buildroot/autobuild/instance-3/output-1/build/wayland-1.18.0/build/meson-logs/meson-log.txt
package/pkg-generic.mk:254: recipe for target '/home/buildroot/autobuild/instance-3/output-1/build/wayland-1.18.0/.stamp_configured' failed
make: *** [/home/buildroot/autobuild/instance-3/output-1/build/wayland-1.18.0/.stamp_configured] Error 1
make: Leaving directory '/home/buildroot/autobuild/instance-3/buildroot'