The cause of this particular issue actually appears to be some symlinks to 
the mpi include directory in my home directory. I am surprised that this 
was the cause of the errors as they still point to the same mpi directory 
that cmake finds. Once I removed them the errors disappeared. While I am 
still compiling, I have passed all previous points where I had errors.

Best,
Alex

On Monday, June 7, 2021 at 5:41:24 p.m. UTC+2 Wolfgang Bangerth wrote:

> On 6/7/21 8:41 AM, Alex Cumberworth wrote:
> > I noticed that I attached the error file for 9.2, and that the source of 
> the 
> > error in 9.3 is different. In 9.2, something goes wrong when one of the 
> > bundled sundials files is compiled, while 9.3, it is when one of the 
> bundled 
> > arborx files is compiled. Both involve the same MPI errors. Both are 
> supposed 
> > to be turned off (output from cmake):
>
> These sorts of things happen because cmake caches stuff from one 
> invocation to 
> another and doesn't notice that you pass flags on the command line that 
> would 
> alter what has been cached before.
>
> Just rm -r the entire build directory before you call cmake and see 
> whether 
> that helps.
>
> Best
> W.
>
> -- 
> ------------------------------------------------------------------------
> Wolfgang Bangerth email: bang...@colostate.edu
> www: http://www.math.colostate.edu/~bangerth/
>
>

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