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"Gtk-WARNING **: language not supported by library C. Using fallback" C "locale. on OS X

Reference Information:

I am using Mac OSX Yosemite.

I installed gtk+

with brew install gtk+

and fixed errors with export PKG_CONFIG_PATH=/opt/X11/lib/pkgconfig

.

I compiled my program using make

, but when I try to run it I get a warning like this:

(process:16182): Gtk-WARNING **: Locale not supported by C library.
        Using the fallback 'C' locale.

Problem: I cannot find any OS X solutions for this specific issue.

What I have learned so far:

  1. In this thread ( Gtk-WARNING **: locale is not supported by C library when using multiple Python modules (mayavi, spectral) ) they suggest using:

    ipython --pylab=wx

    instead ipython --pylab=osx

    but I have no idea how python might be related to my problem (my program is written in C - I think the same applies to gtk+

    )

  2. You can find many topics on this issue, for example: ( Gtk-WARNING **: locale is not supported by the C library when running applications from the command line ), but they are mostly Linux and / or Ubuntu specific.
    Most answers will sooner or later use a command like this:

     sudo dpkg-reconfigure locales

    But on OS X, no dpkg

    .

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1 answer


The problem here is that the environment variable is LANG

not set because I have a mixed setting for Polish and English under Language and Region in System Preferences.

Quoting @KenThomases who helped me a lot with this problem:



In Poland there will be no C library locale defined for English (i.e. en_PL.UTF-8). That's why Terminal doesn't install LANG for you in your shells, even though you've enabled "Set locale environment variables at startup".

You can read an in-depth solution here:
Is it bad that LANG and LC_ALL are empty when running `locale -a` on OS X Yosemite?

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