Hey @ptrblck,
firstly thank you very very much for your help:)
I am running in the first seconds of the installation process in this error:
(after typing the command for the linux installation: BUILD_SOX=1 python setup.py install)
-- Building version 0.9.0a0+b5d8027
running install
running bdist_egg
running egg_info
writing torchaudio.egg-info/PKG-INFO
writing dependency_links to torchaudio.egg-info/dependency_links.txt
writing requirements to torchaudio.egg-info/requires.txt
writing top-level names to torchaudio.egg-info/top_level.txt
reading manifest file 'torchaudio.egg-info/SOURCES.txt'
writing manifest file 'torchaudio.egg-info/SOURCES.txt'
installing library code to build/bdist.linux-x86_64/egg
running install_lib
running build_py
copying torchaudio/version.py -> build/lib.linux-x86_64-3.7/torchaudio
running build_ext
CMake Error: CMake was unable to find a build program corresponding to "Ninja".  CMAKE_MAKE_PROGRAM is not set.  You probably need to select a different build tool.
CMake Error: CMAKE_C_COMPILER not set, after EnableLanguage
CMake Error: CMAKE_CXX_COMPILER not set, after EnableLanguage
-- Configuring incomplete, errors occurred!
See also "/home/pytorch-audio/audio/build/temp.linux-x86_64-3.7/CMakeFiles/CMakeOutput.log".
Traceback (most recent call last):
  File "setup.py", line 91, in <module>
    zip_safe=False,
  File "/home/anaconda3/envs/pytorch-build/lib/python3.7/site-packages/setuptools/__init__.py", line 153, in setup
    return distutils.core.setup(**attrs)
  File "/home/anaconda3/envs/pytorch-build/lib/python3.7/distutils/core.py", line 148, in setup
    dist.run_commands()
  File "/home/anaconda3/envs/pytorch-build/lib/python3.7/distutils/dist.py", line 966, in run_commands
    self.run_command(cmd)
  File "/home/anaconda3/envs/pytorch-build/lib/python3.7/distutils/dist.py", line 985, in run_command
    cmd_obj.run()
  File "/home/jan/anaconda3/envs/pytorch-build/lib/python3.7/site-packages/setuptools/command/install.py", line 67, in run
    self.do_egg_install()
  File "/home/anaconda3/envs/pytorch-build/lib/python3.7/site-packages/setuptools/command/install.py", line 109, in do_egg_install
    self.run_command('bdist_egg')
  File "/home/anaconda3/envs/pytorch-build/lib/python3.7/distutils/cmd.py", line 313, in run_command
    self.distribution.run_command(command)
  File "/home/anaconda3/envs/pytorch-build/lib/python3.7/distutils/dist.py", line 985, in run_command
    cmd_obj.run()
  File "/home/anaconda3/envs/pytorch-build/lib/python3.7/site-packages/setuptools/command/bdist_egg.py", line 164, in run
    cmd = self.call_command('install_lib', warn_dir=0)
  File "/home/anaconda3/envs/pytorch-build/lib/python3.7/site-packages/setuptools/command/bdist_egg.py", line 150, in call_command
    self.run_command(cmdname)
  File "/home/anaconda3/envs/pytorch-build/lib/python3.7/distutils/cmd.py", line 313, in run_command
    self.distribution.run_command(command)
  File "/home/anaconda3/envs/pytorch-build/lib/python3.7/distutils/dist.py", line 985, in run_command
    cmd_obj.run()
  File "/home/anaconda3/envs/pytorch-build/lib/python3.7/site-packages/setuptools/command/install_lib.py", line 11, in run
    self.build()
  File "/home/anaconda3/envs/pytorch-build/lib/python3.7/distutils/command/install_lib.py", line 107, in build
    self.run_command('build_ext')
  File "/home/anaconda3/envs/pytorch-build/lib/python3.7/distutils/cmd.py", line 313, in run_command
    self.distribution.run_command(command)
  File "/home/anaconda3/envs/pytorch-build/lib/python3.7/distutils/dist.py", line 985, in run_command
    cmd_obj.run()
  File "/home/pytorch-audio/audio/build_tools/setup_helpers/extension.py", line 55, in run
    super().run()
  File "/home/anaconda3/envs/pytorch-build/lib/python3.7/site-packages/setuptools/command/build_ext.py", line 79, in run
    _build_ext.run(self)
  File "/home/anaconda3/envs/pytorch-build/lib/python3.7/distutils/command/build_ext.py", line 340, in run
    self.build_extensions()
  File "/home/anaconda3/envs/pytorch-build/lib/python3.7/distutils/command/build_ext.py", line 449, in build_extensions
    self._build_extensions_serial()
  File "/home/anaconda3/envs/pytorch-build/lib/python3.7/distutils/command/build_ext.py", line 474, in _build_extensions_serial
    self.build_extension(ext)
  File "/home/pytorch-audio/audio/build_tools/setup_helpers/extension.py", line 109, in build_extension
    ["cmake", str(_ROOT_DIR)] + cmake_args, cwd=self.build_temp)
  File "/home/anaconda3/envs/pytorch-build/lib/python3.7/subprocess.py", line 347, in check_call
    raise CalledProcessError(retcode, cmd)
subprocess.CalledProcessError: Command '['cmake', '/home/pytorch-audio/audio', '-DCMAKE_BUILD_TYPE=Release', '-DCMAKE_PREFIX_PATH=/home/anaconda3/envs/pytorch-build/lib/python3.7/site-packages/torch/share/cmake', '-DCMAKE_INSTALL_PREFIX=/home/pytorch-audio/audio/build/lib.linux-x86_64-3.7/torchaudio/', '-DCMAKE_VERBOSE_MAKEFILE=ON', '-

It would be very nice if you or someone else could help me out with this:)
Thanks in advance:)