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I was updating some programs on my mac and I suddenly encountered some troubles running gnuplot. The error was something like :

dyld: Library not loaded: /usr/local/opt/readline/lib/libreadline.7.dylib

Referenced from: .../something/...

Reason: image not found

Trace/BPT trap: 5

That's not my own error (I copy paste this one, which is very close, from the internet) because since then I uninstall gnuplot and I can't install it anymore.

When I run brew install gnuplot, I get :

Warning: You are using macOS 10.11.

We (and Apple) do not provide support for this old version.

You will encounter build failures with some formulae.

Please create pull requests instead of asking for help on Homebrew's GitHub,

Discourse, Twitter or IRC. You are responsible for resolving any issues you experience, as you are running this old version.



==> Installing dependencies for gnuplot: graphite2, harfbuzz, pango and qt

==> Installing gnuplot dependency: graphite2

==> Downloading https://github.com/silnrsi/graphite/releases/download/1.3.13/gra

Already downloaded: /Users/me/Library/Caches/Homebrew/downloads/e37be24d841649b167ec4be5e60ac444d5ec859aa32d694e93df5ff36c05b2bf--graphite2-1.3.13.tgz

==> cmake -DCMAKE_C_FLAGS_RELEASE=-DNDEBUG -DCMAKE_CXX_FLAGS_RELEASE=-DNDEBUG -D

Last 15 lines from /Users/me/Library/Logs/Homebrew/graphite2/01.cmake:

2019-01-29 12:04:38 +0100



cmake

-DCMAKE_C_FLAGS_RELEASE=-DNDEBUG

-DCMAKE_CXX_FLAGS_RELEASE=-DNDEBUG

-DCMAKE_INSTALL_PREFIX=/usr/local/Cellar/graphite2/1.3.13

-DCMAKE_BUILD_TYPE=Release

-DCMAKE_FIND_FRAMEWORK=LAST

-DCMAKE_VERBOSE_MAKEFILE=ON

-Wno-dev

-DHAVE_CLOCK_GETTIME:INTERNAL=0



CMake Error: No source or binary directory provided



Do not report this issue to Homebrew/brew or Homebrew/core!



These open issues may also help:

Update graphite2 to reference src dir in cmake https://github.com/Homebrew/homebrew-core/pull/36376



Error: You are using macOS 10.11.

We (and Apple) do not provide support for this old version.

You will encounter build failures with some formulae.

Please create pull requests instead of asking for help on Homebrew's GitHub,

Discourse, Twitter or IRC. You are responsible for resolving any issues you experience, as you are running this old version.

In the install file of gnuplot when I downloaded it from sourceForge I can read :

Readline issues:



As I understand the situation, Apple ships OSX with a "fake" libreadline shared

library. The file /usr/lib/libreadline.dylib is really a symlink to a compatibility

layer over the BSD libedit library. But the compatibility isn't complete, and in

particular it is missing some routines used for readline support by gnuplot. The

./configure script should be able to cope with this. But you will still be left

without some of the functionality of the "real" libreadline. For one thing,

libedit doesn't handle UTF-8 input.



You have several options:



1) Delete the fake libreadline libraries from OSX and install the real gnu

libreadline as a system library.



2) Install the real gnu libreadline into your personal account and tell gnuplot

to use it: ./configure --with-readline=/my/private/readline/installdir

This may require some playing around with additional -L and -I definitions in

CFLAGS, and is probably harder than replacing the system copy of the library.



3) Use gnuplot's built-in readline routines.  These now support UTF-8 input and

tab-completion of file names. ./configure --with-readline=builtin

Do you know How I could do something like the second option with brew ?

Thanks a lot

Edit :

I already try : brew switch readline 8.0.0 and brew install gnuplot --with-readline=/usr/local/Cellar/readline/8.0.0/lib but it doesn't work...

In case it's helpful: I was encountering similar error messages and found that gnuplot depends on gawk, and the version of gawk automatically installed required an outdated version of readline. My gnuplot binary referenced the right version. You can verify using otool:

Gawk references libreadline.7.dylib

$ otool -L /usr/local/bin/awk | grep -i read

    /usr/local/opt/readline/lib/libreadline.7.dylib (compatibility version 7.0.0, current version 7.0.0)

If you're hitting the same issue, I believe you should be able to upgrade gawk.

$ brew upgrade gawk

==> Upgrading 1 outdated package:

gawk 4.2.0_1 -> 4.2.1_1

==> Upgrading gawk 

==> Downloading https://homebrew.bintray.com/bottles/gawk-4.2.1_1.mojave.bottle.

######################################################################## 100.0%

==> Pouring gawk-4.2.1_1.mojave.bottle.1.tar.gz

🍺  /usr/local/Cellar/gawk/4.2.1_1: 87 files, 4.7MB

Removing: /usr/local/Cellar/gawk/4.2.0_1... (69 files, 3MB)



$ otool -L /usr/local/bin/awk | grep -i read    

    /usr/local/opt/readline/lib/libreadline.8.dylib (compatibility version 8.0.0, current version 8.0.0)

Here's the version of gnuplot I have installed.

brew info gnuplot

gnuplot: stable 5.2.6 (bottled), HEAD

Command-driven, interactive function plotting

http://www.gnuplot.info/

/usr/local/Cellar/gnuplot/5.2.6_1 (48 files, 2.9MB) *

In case you have any other binaries in /usr/local that depend on the old readline, you can quickly find them using:

for i in /usr/local/bin/* ; do if otool -L $i | grep -i libreadline.7; then echo "t^ used by $in"; fi; done

You might then have luck upgrading those.