Determining if the include file execinfo.h exists failed with the following output:
Change Dir: /home/buildroot/autobuild/run/instance-0/output-1/build/domoticz-2020.1/CMakeFiles/CMakeTmp

Run Build Command(s):/usr/bin/make cmTC_7a517/fast && make[1]: Entering directory `/home/buildroot/autobuild/run/instance-0/output-1/build/domoticz-2020.1/CMakeFiles/CMakeTmp'
/usr/bin/make -f CMakeFiles/cmTC_7a517.dir/build.make CMakeFiles/cmTC_7a517.dir/build
make[2]: Entering directory `/home/buildroot/autobuild/run/instance-0/output-1/build/domoticz-2020.1/CMakeFiles/CMakeTmp'
Building C object CMakeFiles/cmTC_7a517.dir/CheckIncludeFile.c.o
/home/buildroot/autobuild/run/instance-0/output-1/per-package/domoticz/host/bin/powerpc-buildroot-linux-uclibc-gcc --sysroot=/home/buildroot/autobuild/run/instance-0/output-1/per-package/domoticz/host/powerpc-buildroot-linux-uclibc/sysroot   -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Os   -DNDEBUG   -o CMakeFiles/cmTC_7a517.dir/CheckIncludeFile.c.o   -c /home/buildroot/autobuild/run/instance-0/output-1/build/domoticz-2020.1/CMakeFiles/CMakeTmp/CheckIncludeFile.c
/home/buildroot/autobuild/run/instance-0/output-1/build/domoticz-2020.1/CMakeFiles/CMakeTmp/CheckIncludeFile.c:1:10: fatal error: execinfo.h: No such file or directory
    1 | #include <execinfo.h>
      |          ^~~~~~~~~~~~
compilation terminated.
make[2]: *** [CMakeFiles/cmTC_7a517.dir/CheckIncludeFile.c.o] Error 1
make[2]: Leaving directory `/home/buildroot/autobuild/run/instance-0/output-1/build/domoticz-2020.1/CMakeFiles/CMakeTmp'
make[1]: *** [cmTC_7a517/fast] Error 2
make[1]: Leaving directory `/home/buildroot/autobuild/run/instance-0/output-1/build/domoticz-2020.1/CMakeFiles/CMakeTmp'