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The C, C++ and Fortran compilers are chosen by CMake. (This can be overwritten by setting the environment variables CC, CXX and F77 FC, on the configure command line before you call cmake, to the preferred compiler). Further the variable CMAKE_CXX_FLAGS can be used to set compiler flags for optimisation or debugging. For example, it is recommended to use CMAKE_CXX_FLAGS="-O2 -mtune=native" or any other optimisation to compile Magics.
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