[Varnish] #1555: configure not checking for readline.h, giving make error after fixing it.

[Varnish]

#1555: configure not checking for readline.h, giving make error after fixing it.
-------------------------------------------------+-------------------------
 Reporter:  Tin                                  |       Type:  defect
   Status:  new                                  |   Priority:  normal
Milestone:                                       |  Component:  build
  Version:  4.0.1                                |   Severity:  normal
 Keywords:  readline.h not checked by configure  |
  script                                         |
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 When trying to compile Varnish 4.0.1 on a Cubietruck I ran into the
 following issue;

 make complained about readline.h missing, so obviously the configure
 script didn't complain about that. As the libedit package provied
 readline.h that issue was easy enough to fix.

 When blunty retrying make, without make clean or anything, I ran in the
 error shown in the file error.txt. The correspondig config.log is attached
 as config.log.wrong.

 When doing a fresh rebuild with a clean autogen.sh, ./configure and make,
 compiling did work without an issue. The config.log belonging to that is
 attached as config.log.good.

 Cheers,
 Martin Boer

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Ticket URL: <https://www.varnish-cache.org/trac/ticket/1555>
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