Gstreamer displays error in french, how to change it to english

[Arvin6]

$ gst-launch-1.0 videotestsrc ! videoconvert ! autovideosink

D?finition du pipeline ? PAUSED...
Le pipeline est en phase de PREROLL?
Contexte de l??l?ment ??autovideosink0???: gst.gl.GLDisplay=context,
gst.gl.GLDisplay=(GstGLDisplay)"\(GstGLDisplayCocoa\)\ gldisplaycocoa0";
Le pipeline a termin? la phase PREROLL?
Passage du pipeline ? la phase PLAYING?
New clock: GstSystemClock

** (gst-launch-1.0:87196): CRITICAL **: gst_gl_window_get_context: assertion
'GST_IS_GL_WINDOW (window)' failed
Caught SIGSEGV
exec gdb failed: No such file or directory
Spinning.  Please run 'gdb gst-launch-1.0 87196' to continue debugging,
Ctrl-C to quit, or Ctrl-\ to dump core.

I'm running Mac OSX sierra. The error seemed to be because of autovideosink.



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