Exception: Your system's gstreamer libraries are out of date (we need at least 1.12).

[sijpkes]

I get this error when running the servo/servo project.

OS: OS X Mojave 10.14.5

My actual GStreamer version:

$ gst-inspect-1.0 --version
gst-inspect-1.0 version 1.16.0
GStreamer 1.16.0
Unknown package origin

mach output:

./mach run tests/html/about-mozilla.html
Error running mach:

    ['run', 'tests/html/about-mozilla.html']

The error occurred in code that was called by the mach command. This is either
a bug in the called code itself or in the way that mach is calling it.

You should consider filing a bug for this issue.

If filing a bug, please include the full output of mach, including this error
message.

The details of the failure are as follows:

Exception: Your system's gstreamer libraries are out of date (we need at least 1.12). If you're unable to install them, let us know by filing a bug!

  File "/Users/***/servo/python/servo/post_build_commands.py", line 83, in run
    env = self.build_env()
  File "/Users/***/servo/python/servo/command_base.py", line 612, in build_env
    if self.needs_gstreamer_env(target):
  File "/Users/***/servo/python/servo/command_base.py", line 560, in needs_gstreamer_env
    install them, let us know by filing a bug!")