bc: Readline and Libedit Options

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1 7 Readline and Libedit Options
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1 GNU 'bc' can be compiled (via a configure option) to use the GNU
1 'readline' input editor library or the BSD 'libedit' library.  This
1 allows the user to do more editing of lines before sending them to 'bc'.
1 It also allows for a history of previous lines typed.  When this option
1 is selected, 'bc' has one more special variable.  This special variable,
1 HISTORY is the number of lines of history retained.  A value of -1 means
1 that an unlimited number of history lines are retained.  This is the
1 default value.  Setting the value of HISTORY to a positive number
1 restricts the number of history lines to the number given.  The value of
1 0 disables the history feature.  For more information, read the user
1 manuals for the GNU 'readline', 'history' and BSD 'libedit' libraries.
1 One can not enable both 'readline' and 'libedit' at the same time.
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