[BUG] Build fails with MPI under Win, latest release 2025

[horstsoft0815]

When trying to build on Windows (after generating with CMake) within Visual Studio the build fails simply due to the following line in sundials_mpi_errors.c

#include <unistd.h>

which is only valid for unix systems.

This could for example be fixed by replacing this line by

#ifdef _WIN32
#include <io.h>
#define access _access
#else
#include <unistd.h>
#endif

[balos1]

Thanks for the report. This header is unused, so I have removed it entirely in #807.

[gardner48]

This is fixed in the develop branch and will be included in the next release