$ sudo -H pip3 install -r requirements-pi.txt
Requirement already satisfied: appdirs in /usr/local/lib/python3.7/site-packages/appdirs-1.4.3-py3.7.egg (from -r requirements-pi.txt (line 1)) (1.4.3)
Collecting pycoap
  Cloning git://github.com/moroen/pycoap.git to /tmp/pip-install-au9owool/pycoap
  Running command git clone -q git://github.com/moroen/pycoap.git /tmp/pip-install-au9owool/pycoap
Building wheels for collected packages: pycoap
  Building wheel for pycoap (setup.py) ... error
  ERROR: Command errored out with exit status 1:
   command: /usr/local/bin/python3.7 -u -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/tmp/pip-install-au9owool/pycoap/setup.py'"'"'; __file__='"'"'/tmp/pip-install-au9owool/pycoap/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' bdist_wheel -d /tmp/pip-wheel-mfv22uku --python-tag cp37
       cwd: /tmp/pip-install-au9owool/pycoap/
  Complete output (132 lines):
  running bdist_wheel
  running build
  running build_py
  creating build
  creating build/lib.linux-armv7l-3.7
  creating build/lib.linux-armv7l-3.7/pycoap
  copying pycoap/errors.py -> build/lib.linux-armv7l-3.7/pycoap
  copying pycoap/pycoap.py -> build/lib.linux-armv7l-3.7/pycoap
  copying pycoap/__init__.py -> build/lib.linux-armv7l-3.7/pycoap
  running build_ext
  $ GOPATH=/tmp/tmpnpr7vjz7 go get -d
  /tmp/ccWT95yJ.o: In function `main':
  test.c:(.text+0xc): undefined reference to `f'
  collect2: error: ld returned 1 exit status
  $ CGO_CFLAGS=-I/usr/local/include/python3.7m CGO_LDFLAGS=-Wl,--unresolved-symbols=ignore-all GOPATH=/tmp/tmpnpr7vjz7 go build -buildmode=c-shared -o /tmp/pip-install-au9owool/pycoap/build/lib.linux-armv7l-3.7/_pycoap.cpython-37m-arm-linux-gnueabihf.so
  flag provided but not defined: -buildmode
  usage: build [-o output] [-i] [build flags] [packages]

  Build compiles the packages named by the import paths,
  along with their dependencies, but it does not install the results.

  If the arguments are a list of .go files, build treats them as a list
  of source files specifying a single package.

  When the command line specifies a single main package,
  build writes the resulting executable to output.
  Otherwise build compiles the packages but discards the results,
  serving only as a check that the packages can be built.

  The -o flag specifies the output file name. If not specified, the
  output file name depends on the arguments and derives from the name
  of the package, such as p.a for package p, unless p is 'main'. If
  the package is main and file names are provided, the file name
  derives from the first file name mentioned, such as f1 for 'go build
  f1.go f2.go'; with no files provided ('go build'), the output file
  name is the base name of the containing directory.

  The -i flag installs the packages that are dependencies of the target.

  The build flags are shared by the build, clean, get, install, list, run,
  and test commands:

  	-a
  		force rebuilding of packages that are already up-to-date.
  	-n
  		print the commands but do not run them.
  	-p n
  		the number of builds that can be run in parallel.
  		The default is the number of CPUs available.
  	-race
  		enable data race detection.
  		Supported only on linux/amd64, darwin/amd64 and windows/amd64.
  	-v
  		print the names of packages as they are compiled.
  	-work
  		print the name of the temporary work directory and
  		do not delete it when exiting.
  	-x
  		print the commands.

  	-ccflags 'arg list'
  		arguments to pass on each 5c, 6c, or 8c compiler invocation.
  	-compiler name
  		name of compiler to use, as in runtime.Compiler (gccgo or gc).
  	-gccgoflags 'arg list'
  		arguments to pass on each gccgo compiler/linker invocation.
  	-gcflags 'arg list'
  		arguments to pass on each 5g, 6g, or 8g compiler invocation.
  	-installsuffix suffix
  		a suffix to use in the name of the package installation directory,
  		in order to keep output separate from default builds.
  		If using the -race flag, the install suffix is automatically set to race
  		or, if set explicitly, has _race appended to it.
  	-ldflags 'flag list'
  		arguments to pass on each 5l, 6l, or 8l linker invocation.
  	-tags 'tag list'
  		a list of build tags to consider satisfied during the build.
  		For more information about build tags, see the description of
  		build constraints in the documentation for the go/build package.

  The list flags accept a space-separated list of strings. To embed spaces
  in an element in the list, surround it with either single or double quotes.

  For more about specifying packages, see 'go help packages'.
  For more about where packages and binaries are installed,
  run 'go help gopath'.  For more about calling between Go and C/C++,
  run 'go help c'.

  See also: go install, go get, go clean.
  Traceback (most recent call last):
    File "<string>", line 1, in <module>
    File "/tmp/pip-install-au9owool/pycoap/setup.py", line 20, in <module>
      setup_requires=["setuptools-golang"],
    File "/usr/local/lib/python3.7/site-packages/setuptools/__init__.py", line 145, in setup
      return distutils.core.setup(**attrs)
    File "/usr/local/lib/python3.7/distutils/core.py", line 148, in setup
      dist.run_commands()
    File "/usr/local/lib/python3.7/distutils/dist.py", line 966, in run_commands
      self.run_command(cmd)
    File "/usr/local/lib/python3.7/distutils/dist.py", line 985, in run_command
      cmd_obj.run()
    File "/usr/local/lib/python3.7/site-packages/wheel/bdist_wheel.py", line 192, in run
      self.run_command('build')
    File "/usr/local/lib/python3.7/distutils/cmd.py", line 313, in run_command
      self.distribution.run_command(command)
    File "/usr/local/lib/python3.7/distutils/dist.py", line 985, in run_command
      cmd_obj.run()
    File "/usr/local/lib/python3.7/distutils/command/build.py", line 135, in run
      self.run_command(cmd_name)
    File "/usr/local/lib/python3.7/distutils/cmd.py", line 313, in run_command
      self.distribution.run_command(command)
    File "/usr/local/lib/python3.7/distutils/dist.py", line 985, in run_command
      cmd_obj.run()
    File "/usr/local/lib/python3.7/site-packages/setuptools/command/build_ext.py", line 84, in run
      _build_ext.run(self)
    File "/home/pi/Downloads/ikea-tradfri/ikea-tradfri/.eggs/Cython-0.29.14-py3.7-linux-armv7l.egg/Cython/Distutils/old_build_ext.py", line 186, in run
      _build_ext.build_ext.run(self)
    File "/usr/local/lib/python3.7/distutils/command/build_ext.py", line 340, in run
      self.build_extensions()
    File "/home/pi/Downloads/ikea-tradfri/ikea-tradfri/.eggs/Cython-0.29.14-py3.7-linux-armv7l.egg/Cython/Distutils/old_build_ext.py", line 195, in build_extensions
      _build_ext.build_ext.build_extensions(self)
    File "/usr/local/lib/python3.7/distutils/command/build_ext.py", line 449, in build_extensions
      self._build_extensions_serial()
    File "/usr/local/lib/python3.7/distutils/command/build_ext.py", line 474, in _build_extensions_serial
      self.build_extension(ext)
    File "/tmp/pip-install-au9owool/pycoap/.eggs/setuptools_golang-1.6.0-py3.7.egg/setuptools_golang.py", line 131, in build_extension
      _check_call(cmd_build, cwd=pkg_path, env=env)
    File "/tmp/pip-install-au9owool/pycoap/.eggs/setuptools_golang-1.6.0-py3.7.egg/setuptools_golang.py", line 80, in _check_call
      subprocess.check_call(cmd, cwd=cwd, env=dict(os.environ, **env))
    File "/usr/local/lib/python3.7/subprocess.py", line 347, in check_call
      raise CalledProcessError(retcode, cmd)
  subprocess.CalledProcessError: Command '('go', 'build', '-buildmode=c-shared', '-o', '/tmp/pip-install-au9owool/pycoap/build/lib.linux-armv7l-3.7/_pycoap.cpython-37m-arm-linux-gnueabihf.so')' returned non-zero exit status 2.
  ----------------------------------------
  ERROR: Failed building wheel for pycoap
  Running setup.py clean for pycoap
Failed to build pycoap
Installing collected packages: pycoap
    Running setup.py install for pycoap ... error
    ERROR: Command errored out with exit status 1:
     command: /usr/local/bin/python3.7 -u -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/tmp/pip-install-au9owool/pycoap/setup.py'"'"'; __file__='"'"'/tmp/pip-install-au9owool/pycoap/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' install --record /tmp/pip-record-w5w7hd5y/install-record.txt --single-version-externally-managed --compile
         cwd: /tmp/pip-install-au9owool/pycoap/
    Complete output (134 lines):
    running install
    running build
    running build_py
    creating build
    creating build/lib.linux-armv7l-3.7
    creating build/lib.linux-armv7l-3.7/pycoap
    copying pycoap/errors.py -> build/lib.linux-armv7l-3.7/pycoap
    copying pycoap/pycoap.py -> build/lib.linux-armv7l-3.7/pycoap
    copying pycoap/__init__.py -> build/lib.linux-armv7l-3.7/pycoap
    running build_ext
    $ GOPATH=/tmp/tmpdpwtgly5 go get -d
    /tmp/ccEkWXDH.o: In function `main':
    test.c:(.text+0xc): undefined reference to `f'
    collect2: error: ld returned 1 exit status
    $ CGO_CFLAGS=-I/usr/local/include/python3.7m CGO_LDFLAGS=-Wl,--unresolved-symbols=ignore-all GOPATH=/tmp/tmpdpwtgly5 go build -buildmode=c-shared -o /tmp/pip-install-au9owool/pycoap/build/lib.linux-armv7l-3.7/_pycoap.cpython-37m-arm-linux-gnueabihf.so
    flag provided but not defined: -buildmode
    usage: build [-o output] [-i] [build flags] [packages]

    Build compiles the packages named by the import paths,
    along with their dependencies, but it does not install the results.

    If the arguments are a list of .go files, build treats them as a list
    of source files specifying a single package.

    When the command line specifies a single main package,
    build writes the resulting executable to output.
    Otherwise build compiles the packages but discards the results,
    serving only as a check that the packages can be built.

    The -o flag specifies the output file name. If not specified, the
    output file name depends on the arguments and derives from the name
    of the package, such as p.a for package p, unless p is 'main'. If
    the package is main and file names are provided, the file name
    derives from the first file name mentioned, such as f1 for 'go build
    f1.go f2.go'; with no files provided ('go build'), the output file
    name is the base name of the containing directory.

    The -i flag installs the packages that are dependencies of the target.

    The build flags are shared by the build, clean, get, install, list, run,
    and test commands:

    	-a
    		force rebuilding of packages that are already up-to-date.
    	-n
    		print the commands but do not run them.
    	-p n
    		the number of builds that can be run in parallel.
    		The default is the number of CPUs available.
    	-race
    		enable data race detection.
    		Supported only on linux/amd64, darwin/amd64 and windows/amd64.
    	-v
    		print the names of packages as they are compiled.
    	-work
    		print the name of the temporary work directory and
    		do not delete it when exiting.
    	-x
    		print the commands.

    	-ccflags 'arg list'
    		arguments to pass on each 5c, 6c, or 8c compiler invocation.
    	-compiler name
    		name of compiler to use, as in runtime.Compiler (gccgo or gc).
    	-gccgoflags 'arg list'
    		arguments to pass on each gccgo compiler/linker invocation.
    	-gcflags 'arg list'
    		arguments to pass on each 5g, 6g, or 8g compiler invocation.
    	-installsuffix suffix
    		a suffix to use in the name of the package installation directory,
    		in order to keep output separate from default builds.
    		If using the -race flag, the install suffix is automatically set to race
    		or, if set explicitly, has _race appended to it.
    	-ldflags 'flag list'
    		arguments to pass on each 5l, 6l, or 8l linker invocation.
    	-tags 'tag list'
    		a list of build tags to consider satisfied during the build.
    		For more information about build tags, see the description of
    		build constraints in the documentation for the go/build package.

    The list flags accept a space-separated list of strings. To embed spaces
    in an element in the list, surround it with either single or double quotes.

    For more about specifying packages, see 'go help packages'.
    For more about where packages and binaries are installed,
    run 'go help gopath'.  For more about calling between Go and C/C++,
    run 'go help c'.

    See also: go install, go get, go clean.
    Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File "/tmp/pip-install-au9owool/pycoap/setup.py", line 20, in <module>
        setup_requires=["setuptools-golang"],
      File "/usr/local/lib/python3.7/site-packages/setuptools/__init__.py", line 145, in setup
        return distutils.core.setup(**attrs)
      File "/usr/local/lib/python3.7/distutils/core.py", line 148, in setup
        dist.run_commands()
      File "/usr/local/lib/python3.7/distutils/dist.py", line 966, in run_commands
        self.run_command(cmd)
      File "/usr/local/lib/python3.7/distutils/dist.py", line 985, in run_command
        cmd_obj.run()
      File "/usr/local/lib/python3.7/site-packages/setuptools/command/install.py", line 61, in run
        return orig.install.run(self)
      File "/usr/local/lib/python3.7/distutils/command/install.py", line 545, in run
        self.run_command('build')
      File "/usr/local/lib/python3.7/distutils/cmd.py", line 313, in run_command
        self.distribution.run_command(command)
      File "/usr/local/lib/python3.7/distutils/dist.py", line 985, in run_command
        cmd_obj.run()
      File "/usr/local/lib/python3.7/distutils/command/build.py", line 135, in run
        self.run_command(cmd_name)
      File "/usr/local/lib/python3.7/distutils/cmd.py", line 313, in run_command
        self.distribution.run_command(command)
      File "/usr/local/lib/python3.7/distutils/dist.py", line 985, in run_command
        cmd_obj.run()
      File "/usr/local/lib/python3.7/site-packages/setuptools/command/build_ext.py", line 84, in run
        _build_ext.run(self)
      File "/home/pi/Downloads/ikea-tradfri/ikea-tradfri/.eggs/Cython-0.29.14-py3.7-linux-armv7l.egg/Cython/Distutils/old_build_ext.py", line 186, in run
        _build_ext.build_ext.run(self)
      File "/usr/local/lib/python3.7/distutils/command/build_ext.py", line 340, in run
        self.build_extensions()
      File "/home/pi/Downloads/ikea-tradfri/ikea-tradfri/.eggs/Cython-0.29.14-py3.7-linux-armv7l.egg/Cython/Distutils/old_build_ext.py", line 195, in build_extensions
        _build_ext.build_ext.build_extensions(self)
      File "/usr/local/lib/python3.7/distutils/command/build_ext.py", line 449, in build_extensions
        self._build_extensions_serial()
      File "/usr/local/lib/python3.7/distutils/command/build_ext.py", line 474, in _build_extensions_serial
        self.build_extension(ext)
      File "/tmp/pip-install-au9owool/pycoap/.eggs/setuptools_golang-1.6.0-py3.7.egg/setuptools_golang.py", line 131, in build_extension
        _check_call(cmd_build, cwd=pkg_path, env=env)
      File "/tmp/pip-install-au9owool/pycoap/.eggs/setuptools_golang-1.6.0-py3.7.egg/setuptools_golang.py", line 80, in _check_call
        subprocess.check_call(cmd, cwd=cwd, env=dict(os.environ, **env))
      File "/usr/local/lib/python3.7/subprocess.py", line 347, in check_call
        raise CalledProcessError(retcode, cmd)
    subprocess.CalledProcessError: Command '('go', 'build', '-buildmode=c-shared', '-o', '/tmp/pip-install-au9owool/pycoap/build/lib.linux-armv7l-3.7/_pycoap.cpython-37m-arm-linux-gnueabihf.so')' returned non-zero exit status 2.
    ----------------------------------------
ERROR: Command errored out with exit status 1: /usr/local/bin/python3.7 -u -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/tmp/pip-install-au9owool/pycoap/setup.py'"'"'; __file__='"'"'/tmp/pip-install-au9owool/pycoap/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' install --record /tmp/pip-record-w5w7hd5y/install-record.txt --single-version-externally-managed --compile Check the logs for full command output.