Determining if the include file process.h exists failed with the following output:
Change Dir: /home/buildroot/autobuild/run/instance-1/output-1/build/exiv2-0.27.4/CMakeFiles/CMakeTmp

Run Build Command(s):/usr/bin/make cmTC_48e6c/fast && make[1]: Entering directory `/home/buildroot/autobuild/run/instance-1/output-1/build/exiv2-0.27.4/CMakeFiles/CMakeTmp'
/usr/bin/make  -f CMakeFiles/cmTC_48e6c.dir/build.make CMakeFiles/cmTC_48e6c.dir/build
make[2]: Entering directory `/home/buildroot/autobuild/run/instance-1/output-1/build/exiv2-0.27.4/CMakeFiles/CMakeTmp'
Building CXX object CMakeFiles/cmTC_48e6c.dir/CheckIncludeFile.cxx.o
/home/buildroot/autobuild/run/instance-1/output-1/host/bin/x86_64-linux-g++ --sysroot=/home/buildroot/autobuild/run/instance-1/output-1/host/x86_64-buildroot-linux-uclibc/sysroot    -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Os -g0   -DNDEBUG   -o CMakeFiles/cmTC_48e6c.dir/CheckIncludeFile.cxx.o -c /home/buildroot/autobuild/run/instance-1/output-1/build/exiv2-0.27.4/CMakeFiles/CMakeTmp/CheckIncludeFile.cxx
/home/buildroot/autobuild/run/instance-1/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.
make[2]: *** [CMakeFiles/cmTC_48e6c.dir/CheckIncludeFile.cxx.o] Error 1
make[2]: Leaving directory `/home/buildroot/autobuild/run/instance-1/output-1/build/exiv2-0.27.4/CMakeFiles/CMakeTmp'
make[1]: *** [cmTC_48e6c/fast] Error 2
make[1]: Leaving directory `/home/buildroot/autobuild/run/instance-1/output-1/build/exiv2-0.27.4/CMakeFiles/CMakeTmp'