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The gawk debugger can optionally use readline for user input during the debugging session (for the usual autocompletion and stuff). Enable readline support when the readline package is enabled; let ./configure automatically find it. Forcibly disable readline support when the readline package is disabled. Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr> Cc: Peter Korsgaard <jacmet@uclibc.org> Reviewed-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>