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Running ./configure gives me this:

-- Checking if compiler supports needed C++17 constructs
-- Checking if compiler supports needed C++17 constructs - yes
-- Checking if compiler supports C++ make_unique
-- Checking if compiler supports C++ make_unique - no
-- Checking if compiler supports C++ unique_ptr
-- Checking if compiler supports C++ unique_ptr - no
CMake Error at CMakeLists.txt:92 (message):
  The C++ compiler does not support C++11 (e.g.  std::unique_ptr).


-- Configuring incomplete, errors occurred!
See also "/home/mwarning/cmake/CMakeFiles/CMakeOutput.log".
See also "/home/mwarning/cmake/CMakeFiles/CMakeError.log".
---------------------------------------------
Error when bootstrapping CMake:
Problem while running initial CMake
---------------------------------------------

The cause is this line:

if(check_output MATCHES "[Ww]arning")

(https://github.com/Kitware/CMake/blob/master/Source/Checks/cm_cxx_features.cmake#L30)

... and my username is part of the path in the output.