Determining if the include file io.h exists failed with the following output:
Change Dir: /home/thomas/autobuild/instance-1/output-1/build/cmocka-1.1.5/buildroot-build/CMakeFiles/CMakeTmp

Run Build Command(s):/usr/bin/make -f Makefile cmTC_44c9f/fast && make[1]: Entering directory '/home/thomas/autobuild/instance-1/output-1/build/cmocka-1.1.5/buildroot-build/CMakeFiles/CMakeTmp'
/usr/bin/make  -f CMakeFiles/cmTC_44c9f.dir/build.make CMakeFiles/cmTC_44c9f.dir/build
make[2]: Entering directory '/home/thomas/autobuild/instance-1/output-1/build/cmocka-1.1.5/buildroot-build/CMakeFiles/CMakeTmp'
Building C object CMakeFiles/cmTC_44c9f.dir/CheckIncludeFile.c.o
/home/thomas/autobuild/instance-1/output-1/host/bin/arm-buildroot-linux-gnueabi-gcc --sysroot=/home/thomas/autobuild/instance-1/output-1/host/arm-buildroot-linux-gnueabi/sysroot   -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -O3 -g0 -D_FORTIFY_SOURCE=1   -DNDEBUG -fPIE -o CMakeFiles/cmTC_44c9f.dir/CheckIncludeFile.c.o -c /home/thomas/autobuild/instance-1/output-1/build/cmocka-1.1.5/buildroot-build/CMakeFiles/CMakeTmp/CheckIncludeFile.c
/home/thomas/autobuild/instance-1/output-1/build/cmocka-1.1.5/buildroot-build/CMakeFiles/CMakeTmp/CheckIncludeFile.c:1:10: fatal error: io.h: No such file or directory
    1 | #include <io.h>
      |          ^~~~~~
compilation terminated.
make[2]: *** [CMakeFiles/cmTC_44c9f.dir/build.make:78: CMakeFiles/cmTC_44c9f.dir/CheckIncludeFile.c.o] Error 1
make[2]: Leaving directory '/home/thomas/autobuild/instance-1/output-1/build/cmocka-1.1.5/buildroot-build/CMakeFiles/CMakeTmp'
make[1]: *** [Makefile:127: cmTC_44c9f/fast] Error 2
make[1]: Leaving directory '/home/thomas/autobuild/instance-1/output-1/build/cmocka-1.1.5/buildroot-build/CMakeFiles/CMakeTmp'