Determining if the include file process.h exists failed with the following output:
Change Dir: /usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-0/output-1/build/exiv2-0.27.4/CMakeFiles/CMakeTmp

Run Build Command(s):/usr/bin/gmake cmTC_6b588/fast && gmake[1]: Entering directory `/usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-0/output-1/build/exiv2-0.27.4/CMakeFiles/CMakeTmp'
/usr/bin/gmake  -f CMakeFiles/cmTC_6b588.dir/build.make CMakeFiles/cmTC_6b588.dir/build
gmake[2]: Entering directory `/usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-0/output-1/build/exiv2-0.27.4/CMakeFiles/CMakeTmp'
Building CXX object CMakeFiles/cmTC_6b588.dir/CheckIncludeFile.cxx.o
/usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-0/output-1/host/bin/i686-linux-g++ --sysroot=/usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-0/output-1/host/i686-buildroot-linux-uclibc/sysroot    -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Os -g0   -DNDEBUG   -o CMakeFiles/cmTC_6b588.dir/CheckIncludeFile.cxx.o -c /usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-0/output-1/build/exiv2-0.27.4/CMakeFiles/CMakeTmp/CheckIncludeFile.cxx
/usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-0/output-1/build/exiv2-0.27.4/CMakeFiles/CMakeTmp/CheckIncludeFile.cxx:1:10: fatal error: process.h: No such file or directory
    1 | #include <process.h>
      |          ^~~~~~~~~~~
compilation terminated.
gmake[2]: *** [CMakeFiles/cmTC_6b588.dir/CheckIncludeFile.cxx.o] Error 1
gmake[2]: Leaving directory `/usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-0/output-1/build/exiv2-0.27.4/CMakeFiles/CMakeTmp'
gmake[1]: *** [cmTC_6b588/fast] Error 2
gmake[1]: Leaving directory `/usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-0/output-1/build/exiv2-0.27.4/CMakeFiles/CMakeTmp'