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### 3.11 `GFORTRAN_ERROR_BACKTRACE`—Show backtrace on run-time errors

If the `GFORTRAN_ERROR_BACKTRACE` variable is set to ``y`', ``Y`' or ``1`' (only the first letter is relevant) then a backtrace is printed when a serious run-time error occurs. To disable the backtracing, set the variable to ``n`', ``N`', ``0`'. Default is to print a backtrace unless the `-fno-backtrace` compile option was used.