>>> avro-c 1.9.1 Extracting
gzip -d -c /data/buildroot/buildroot-test/instance-0/dl/avro-c/avro-c-1.9.1.tar.gz | /data/buildroot/buildroot-test/instance-0/output/host/bin/tar --strip-components=1 -C /data/buildroot/buildroot-test/instance-0/output/build/avro-c-1.9.1   -xf -
>>> avro-c 1.9.1 Patching

Applying 0001-Allow-avro-C-to-be-built-on-musl-based-systems.patch using patch: 
patching file src/avro_generic_internal.h
>>> avro-c 1.9.1 Configuring
(mkdir -p /data/buildroot/buildroot-test/instance-0/output/build/avro-c-1.9.1/ && cd /data/buildroot/buildroot-test/instance-0/output/build/avro-c-1.9.1/ && rm -f CMakeCache.txt && PATH="/data/buildroot/buildroot-test/instance-0/output/host/bin:/data/buildroot/buildroot-test/instance-0/output/host/sbin:/data/buildroot/buildroot-test/venv/bin:/usr/local/sbin:/usr/local/bin:/usr/bin:/usr/bin/site_perl:/usr/bin/vendor_perl:/usr/bin/core_perl"  /data/buildroot/buildroot-test/instance-0/output/host/bin/cmake /data/buildroot/buildroot-test/instance-0/output/build/avro-c-1.9.1/ -DCMAKE_TOOLCHAIN_FILE="/data/buildroot/buildroot-test/instance-0/output/host/share/buildroot/toolchainfile.cmake" -DCMAKE_INSTALL_PREFIX="/usr" -DCMAKE_COLOR_MAKEFILE=OFF -DBUILD_DOC=OFF -DBUILD_DOCS=OFF -DBUILD_EXAMPLE=OFF -DBUILD_EXAMPLES=OFF -DBUILD_TEST=OFF -DBUILD_TESTS=OFF -DBUILD_TESTING=OFF -DBUILD_SHARED_LIBS=ON   )
-- The C compiler identification is GNU 8.3.0
-- The CXX compiler identification is unknown
-- Check for working C compiler: /data/buildroot/buildroot-test/instance-0/output/host/bin/arm-linux-gcc
-- Check for working C compiler: /data/buildroot/buildroot-test/instance-0/output/host/bin/arm-linux-gcc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
CMake Error at CMakeLists.txt:20 (project):
  The CMAKE_CXX_COMPILER:

    /data/buildroot/buildroot-test/instance-0/output/host/bin/arm-linux-g++

  is not a full path to an existing compiler tool.

  Tell CMake where to find the compiler by setting either the environment
  variable "CXX" or the CMake cache entry CMAKE_CXX_COMPILER to the full path
  to the compiler, or to the compiler name if it is in the PATH.


-- Configuring incomplete, errors occurred!
See also "/data/buildroot/buildroot-test/instance-0/output/build/avro-c-1.9.1/CMakeFiles/CMakeOutput.log".
See also "/data/buildroot/buildroot-test/instance-0/output/build/avro-c-1.9.1/CMakeFiles/CMakeError.log".
make: *** [package/pkg-generic.mk:250: /data/buildroot/buildroot-test/instance-0/output/build/avro-c-1.9.1/.stamp_configured] Error 1
make: Leaving directory '/data/buildroot/buildroot-test/instance-0/buildroot'