anchor.diff:  REM nix-mx requires nixversion file in ../nix/include/nix
   IF EXIST %NIX_ROOT%\build\include\nix\nixversion.hpp (
   	COPY %NIX_ROOT%\build\include\nix\nixversion.hpp %NIX_ROOT%\include\nix\
  +)
   )
   
   ECHO --------------------------------------------------------------------------
  
positive.code: ECHO BOOST_INCLUDEDIR=%BOOST_INCLUDEDIR%, checking directory...
  IF EXIST %BOOST_ROOT% (ECHO boost OK) ELSE (EXIT /b)
  
  ECHO --------------------------------------------------------------------------
  ECHO Setting up nix build ...
  ECHO --------------------------------------------------------------------------
  
negative.code: SET HDF5_VERSION_DIR=hdf5-1.10.1
  REM Static build requires cmake version 3.9.1
  SET CMAKEVER=3.9.1
  REM Leave NIX_MX_ONLY "" for full nix and nix-mx build
  SET NIX_MX_ONLY=""
  
  ECHO --------------------------------------------------------------------------
  ECHO Checking dependencies ...
  