$ pip install -r requirements.txt
You are using pip version 6.0.8, however version 19.2.1 is available.
You should consider upgrading via the 'pip install --upgrade pip' command.
Collecting opentracing<3,>=2 (from -r requirements.txt (line 1))
Using cached https://files.pythonhosted.org/packages/94/9f/289424136addf621fb4c75624ef9a3a80e8575da3993a87950c57e93217e/opentracing-2.2.0.tar.gz
/tmp/pip-build-iBcehI/opentracing/setup.py:12: DeprecationWarning: Parameters to load are deprecated. Call .resolve and .require separately.
url='https://github.com/opentracing/opentracing-python',
Obtaining jaeger-client from git+https://github.com/yurishkuro/jaeger-client-python.git@d631596415cb549a4e8314cc25d6c53fab710528#egg=jaeger-client (from -r requirements.txt (line 6))
Cloning https://github.com/yurishkuro/jaeger-client-python.git (to d631596415cb549a4e8314cc25d6c53fab710528) to ./env/src/jaeger-client
Could not find a tag or branch 'd631596415cb549a4e8314cc25d6c53fab710528', assuming commit.
perl: warning: Setting locale failed.
perl: warning: Please check that your locale settings:
LANGUAGE = (unset),
LC_ALL = (unset),
LC_CTYPE = "UTF-8",
LANG = "en_US.UTF-8"
are supported and installed on your system.
perl: warning: Falling back to the standard locale ("C").
perl: warning: Setting locale failed.
perl: warning: Please check that your locale settings:
LANGUAGE = (unset),
LC_ALL = (unset),
LC_CTYPE = "UTF-8",
LANG = "en_US.UTF-8"
are supported and installed on your system.
perl: warning: Falling back to the standard locale ("C").
perl: warning: Setting locale failed.
perl: warning: Please check that your locale settings:
LANGUAGE = (unset),
LC_ALL = (unset),
LC_CTYPE = "UTF-8",
LANG = "en_US.UTF-8"
are supported and installed on your system.
perl: warning: Falling back to the standard locale ("C").
perl: warning: Setting locale failed.
perl: warning: Please check that your locale settings:
LANGUAGE = (unset),
LC_ALL = (unset),
LC_CTYPE = "UTF-8",
LANG = "en_US.UTF-8"
are supported and installed on your system.
perl: warning: Falling back to the standard locale ("C").
error in jaeger-client setup command: Invalid environment marker: python_version<"3"
Complete output from command python setup.py egg_info:
error in jaeger-client setup command: Invalid environment marker: python_version<"3"
----------------------------------------
Command "python setup.py egg_info" failed with error code 1 in ./env/src/jaeger-client```