Determining if the include file io.h exists failed with the following output: Change Dir: /home/buildroot/autobuild/instance-2/output-1/build/cmocka-1.1.5/buildroot-build/CMakeFiles/CMakeTmp Run Build Command(s):/usr/bin/make cmTC_0df7c/fast && make[1]: Entering directory '/home/buildroot/autobuild/instance-2/output-1/build/cmocka-1.1.5/buildroot-build/CMakeFiles/CMakeTmp' /usr/bin/make -f CMakeFiles/cmTC_0df7c.dir/build.make CMakeFiles/cmTC_0df7c.dir/build make[2]: Entering directory '/home/buildroot/autobuild/instance-2/output-1/build/cmocka-1.1.5/buildroot-build/CMakeFiles/CMakeTmp' Building C object CMakeFiles/cmTC_0df7c.dir/CheckIncludeFile.c.o /home/buildroot/autobuild/instance-2/output-1/host/bin/riscv64-buildroot-linux-musl-gcc --sysroot=/home/buildroot/autobuild/instance-2/output-1/host/riscv64-buildroot-linux-musl/sysroot -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -O2 -DNDEBUG -fPIE -o CMakeFiles/cmTC_0df7c.dir/CheckIncludeFile.c.o -c /home/buildroot/autobuild/instance-2/output-1/build/cmocka-1.1.5/buildroot-build/CMakeFiles/CMakeTmp/CheckIncludeFile.c /home/buildroot/autobuild/instance-2/output-1/build/cmocka-1.1.5/buildroot-build/CMakeFiles/CMakeTmp/CheckIncludeFile.c:1:10: fatal error: io.h: No such file or directory #include ^~~~~~ compilation terminated. CMakeFiles/cmTC_0df7c.dir/build.make:65: recipe for target 'CMakeFiles/cmTC_0df7c.dir/CheckIncludeFile.c.o' failed make[2]: *** [CMakeFiles/cmTC_0df7c.dir/CheckIncludeFile.c.o] Error 1 make[2]: Leaving directory '/home/buildroot/autobuild/instance-2/output-1/build/cmocka-1.1.5/buildroot-build/CMakeFiles/CMakeTmp' Makefile:121: recipe for target 'cmTC_0df7c/fast' failed make[1]: *** [cmTC_0df7c/fast] Error 2 make[1]: Leaving directory '/home/buildroot/autobuild/instance-2/output-1/build/cmocka-1.1.5/buildroot-build/CMakeFiles/CMakeTmp'