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+FFLAGS
+------
+
+Default compilation flags to be used when compiling ``Fortran`` files. Will only
+be used by CMake on the first configuration to determine ``Fortran`` default
+compilation flags, after which the value for ``FFLAGS`` is stored in the cache
+as :variable:`CMAKE_Fortran_FLAGS <CMAKE_<LANG>_FLAGS>`. For any configuration
+run (including the first), the environment variable will be ignored if
+the :variable:`CMAKE_Fortran_FLAGS <CMAKE_<LANG>_FLAGS>` variable is defined.