Determining if the include file process.h exists failed with the following output:
Change Dir: /tmp/instance-0/output-1/build/exiv2-0.27.4/CMakeFiles/CMakeTmp

Run Build Command(s):/usr/bin/make cmTC_e991a/fast && make[1]: Entering directory '/tmp/instance-0/output-1/build/exiv2-0.27.4/CMakeFiles/CMakeTmp'
/usr/bin/make  -f CMakeFiles/cmTC_e991a.dir/build.make CMakeFiles/cmTC_e991a.dir/build
make[2]: Entering directory '/tmp/instance-0/output-1/build/exiv2-0.27.4/CMakeFiles/CMakeTmp'
Building CXX object CMakeFiles/cmTC_e991a.dir/CheckIncludeFile.cxx.o
/tmp/instance-0/output-1/host/bin/x86_64-linux-g++ --sysroot=/tmp/instance-0/output-1/host/x86_64-buildroot-linux-uclibc/sysroot    -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Os -g2    -o CMakeFiles/cmTC_e991a.dir/CheckIncludeFile.cxx.o -c /tmp/instance-0/output-1/build/exiv2-0.27.4/CMakeFiles/CMakeTmp/CheckIncludeFile.cxx
/tmp/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.
make[2]: *** [CMakeFiles/cmTC_e991a.dir/build.make:69: CMakeFiles/cmTC_e991a.dir/CheckIncludeFile.cxx.o] Error 1
make[2]: Leaving directory '/tmp/instance-0/output-1/build/exiv2-0.27.4/CMakeFiles/CMakeTmp'
make[1]: *** [Makefile:124: cmTC_e991a/fast] Error 2
make[1]: Leaving directory '/tmp/instance-0/output-1/build/exiv2-0.27.4/CMakeFiles/CMakeTmp'