>>> paho-mqtt-c 1.3.2 Extracting
gzip -d -c /home/buildroot/autobuild/instance-1/dl/paho-mqtt-c/paho-mqtt-c-1.3.2.tar.gz | tar --strip-components=1 -C /home/buildroot/autobuild/instance-1/output-1/build/paho-mqtt-c-1.3.2   -xf -
>>> paho-mqtt-c 1.3.2 Patching

Applying 0001-src-CMakeLists.txt-fix-build-on-uclibc-or-musl.patch using patch: 
patching file src/CMakeLists.txt
>>> paho-mqtt-c 1.3.2 Configuring
(mkdir -p /home/buildroot/autobuild/instance-1/output-1/build/paho-mqtt-c-1.3.2/ && cd /home/buildroot/autobuild/instance-1/output-1/build/paho-mqtt-c-1.3.2/ && rm -f CMakeCache.txt && PATH="/home/buildroot/autobuild/instance-1/output-1/host/bin:/home/buildroot/autobuild/instance-1/output-1/host/sbin:/usr/local/bin:/usr/bin:/bin:/usr/local/games:/usr/games"  /home/buildroot/autobuild/instance-1/output-1/host/bin/cmake /home/buildroot/autobuild/instance-1/output-1/build/paho-mqtt-c-1.3.2/ -DCMAKE_TOOLCHAIN_FILE="/home/buildroot/autobuild/instance-1/output-1/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  -DPAHO_ENABLE_TESTING=FALSE -DPAHO_ENABLE_CPACK=FALSE -DPAHO_WITH_SSL=TRUE )
-- The C compiler identification is GNU 8.3.0
-- Check for working C compiler: /home/buildroot/autobuild/instance-1/output-1/host/bin/arm-linux-gcc
-- Check for working C compiler: /home/buildroot/autobuild/instance-1/output-1/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 version: 3.15.5
-- CMake system name: Linux
-- The CXX compiler identification is unknown
CMake Error at CMakeLists.txt:34 (ENABLE_LANGUAGE):
  The CMAKE_CXX_COMPILER:

    /home/buildroot/autobuild/instance-1/output-1/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 "/home/buildroot/autobuild/instance-1/output-1/build/paho-mqtt-c-1.3.2/CMakeFiles/CMakeOutput.log".
See also "/home/buildroot/autobuild/instance-1/output-1/build/paho-mqtt-c-1.3.2/CMakeFiles/CMakeError.log".
package/pkg-generic.mk:254: recipe for target '/home/buildroot/autobuild/instance-1/output-1/build/paho-mqtt-c-1.3.2/.stamp_configured' failed
make: *** [/home/buildroot/autobuild/instance-1/output-1/build/paho-mqtt-c-1.3.2/.stamp_configured] Error 1
make: Leaving directory '/home/buildroot/autobuild/instance-1/buildroot'