Hi folks,

I'm getting the error "The version number of boost that you are compiling 
with does not match the version number of boost found during deal.II's 
configuration step." when I try to compile the first tutorial program. It 
is thrown at /usr/local/include/deal.II/base/config.h:508:17

This is confusing to me, because when I go into 
/usr/include/boost/version.hpp, it states that my BOOST_VERSION is 106700. 
Further, in /usr/local/include/deal.II/base/config.h, it says that my 
DEAL_II_BOOST_VERSION_MAJOR is 1, DEAL_II_BOOST_VERSION_MINOR is 67, and 
DEAL_II_BOOST_VERSION_SUBMINOR is 0 which makes my 
DEAL_II_BOOST_VERSION_GTE 106700, the same as what boost says it ought to 
be.

For context, I had installed dealii version 9.2.0 earlier, but had problems 
when I tried to update it to include CUDA (I think there was some API 
change with CUDA 11). I then installed dealii version 9.3.1 (without doing 
anything to the other version). Now none of the example files in version 
9.3.1 will compile.

Any help is appreciated, thanks so much

Kind regards,
Lucas

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