science/hdf5 should be upgraded to 1.12, but some ports are not compatible with this version, and it has been suggested to repocopy the actual port to science/hdf5-110.
PR 251894 proposes a patch to do that, and an exp-run has been launched to detect the incompatibilities.
Unfortunately, your port science/chemps2 failed: see
Could you please propose a patch, either to fix it with 1.12 or to switch to hdf5-110?
1.8.10 should build fine with HDF5 1.12.
A commit references this bug:
Date: Mon Feb 1 09:53:55 UTC 2021
New revision: 563561
science/chemps2: Update 1.8.9 -> 1.8.10