OSX: CMake fails to detect version of brew HDF5

[KrisThielemans]

When using USE_SYSTEM_HDF5=ON on OSX, we get

CMake Error at /usr/local/Cellar/cmake/3.11.4/share/cmake/Modules/FindPackageHandleStandardArgs.cmake:137 (message):
  Could NOT find HDF5: Found unsuitable version "", but required is at least
  "1.8" (found HDF5_hdf5_LIBRARY-NOTFOUND)

This does not occur when building our own HDF5 (v1.10.1). OSX 10.13.3, brew HDF5 claims to be 1.8.

[KrisThielemans]

@rijobro, could you check this with recent CMake and brew and update accordingly? The only thing we can do is to document it on the Wiki. After that's done, please close this.

[rijobro]

I use Brew installed HDF5 and don't have any problems. Not sure how you want me to document this.

[KrisThielemans]

what version of HDF5 does brew currently install? If it's still 1.8, then presumably your CMake is more recent than 3.11.4. We should then either require CMake 3.12 on OSX, or put it in the wiki that USE_SYSTEM_HDF5=ON might fail with CMake version 3.11 (or presumably earlier)

[rijobro]

current version installed by brew is 1.10.4. Will update the wiki for the CMake version.

[rijobro]

instruct users to use >=3.12 here: https://github.com/CCPPETMR/SIRF/wiki/SIRF-SuperBuild-on-MacOS