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Instead of hard-coding the command to run, using the environment variable `GDB_CMD` (that defaults to `gdb`) allows using a different debugger than the default `gdb` executable. This gives the possibility to use `cgdb` as the debugger, which provides a nicer user interface. Note that one has to use `GDB_CMD="cgdb --"` to use cgdb (note the trailing `--`) to let cgdb pass the proper arguments to `gdb`.