Dear group, 

As part of the steps to configure and install deal.ii on my ubuntu 20.04, I 
reached the point where I run the 'make' command. It pulls a long error 
with this near the end:

/usr/local/include/Kokkos_Core.hpp: In function ‘std::vector<ValueType> 
Kokkos::Experimental::partition_space(const ExecSpace&, Args ...)’:
/usr/local/include/Kokkos_Core.hpp:268:20: error: ‘is_arithmetic_v’ is not 
a member of ‘std’; did you mean ‘is_arithmetic’?
  268 |       (... && std::is_arithmetic_v<Args>),
      |                    ^~~~~~~~~~~~~~~
      |                    is_arithmetic
/usr/local/include/Kokkos_Core.hpp:268:35: error: expected ‘)’ before ‘<’ 
token
  268 |       (... && std::is_arithmetic_v<Args>),
      |       ~                           ^
      |                                   )
/usr/local/include/Kokkos_Core.hpp:269:73: error: expected ‘,’ before ‘;’ 
token
  269 |       "Kokkos Error: partitioning arguments must be integers or 
floats");
      |                                                                     
    ^
      |                                                                     
    ,
/usr/local/include/Kokkos_Core.hpp:269:73: error: expected string-literal 
before ‘;’ token
/usr/local/include/Kokkos_Core.hpp:269:73: error: expected ‘)’ before ‘;’ 
token
  269 |       "Kokkos Error: partitioning arguments must be integers or 
floats");
      |                                                                     
    ^
      |                                                                     
    )
/usr/local/include/Kokkos_Core.hpp:267:16: note: to match this ‘(’
  267 |   static_assert(
      |                ^
make[2]: *** 
[source/numerics/CMakeFiles/object_numerics_release.dir/build.make:63: 
source/numerics/CMakeFiles/object_numerics_release.dir/data_out.cc.o] Error 
1
make[1]: *** [CMakeFiles/Makefile2:1682: 
source/numerics/CMakeFiles/object_numerics_release.dir/all] Error 2
make: *** [Makefile:130: all] Error 2



Any ideas on what I can do to solve this and finish the installation?

Thank you.

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