Known Problem with the Perl APIs ================================ The Perl APIs were created with HDF5 1.6, and were not tested with HDF5 1.8. The H5P_MOUNT variable will not be found if using the Perl APIs with HDF5 1.8, because H5P_MOUNT was changed to H5P_FILE_MOUNT in HDF5 1.8. Simply changing all references to H5P_MOUNT in the Perl APIs to H5P_FILE_MOUNT, will allow you to use the Perl APIs with HDF5 1.8.