[Bug 197995] math/gnuplot: hidden dependency on devel/readline

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=197995

            Bug ID: 197995
           Summary: math/gnuplot: hidden dependency on devel/readline
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: freebsd-ports-bugs at FreeBSD.org
          Reporter: amdmi3 at FreeBSD.org
                CC: glewis at FreeBSD.org, johans at FreeBSD.org
                CC: glewis at FreeBSD.org, johans at FreeBSD.org

If gnuplot is built with devel/readline installed, it's picked as a hidden
library dependency, and if readline is removed afterwards, gnuplot would break.

% pkg info | grep readline
readline-6.3.8                 Library for editing command lines as they are
typed
% ldd /usr/local/bin/gnuplot | grep readline
        libreadline.so.6 => /usr/local/lib/libreadline.so.6 (0x800951000)
% pkg delete readline
% ldd /usr/local/bin/gnuplot | grep readline
        libreadline.so.6 => not found (0)
% portmaster gnuplot
% ldd /usr/local/bin/gnuplot | grep readline
        libreadline.so.8 => /lib/libreadline.so.8 (0x800951000)

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