There are some earlier questions, most notably this, but they didn't help me. I am trying to install llvm version 10 (or 9) because it is a dependency for the pyod Python package. When trying to install, I get this error:

(.venv) user@desktop:/media/Projects/outliers$ pip install llvmlite

Collecting llvmlite

  Using cached https://files.pythonhosted.org/packages/0b/96/07bfa93a103fb9e3e9ae7f9f7c6687ae714aee66b6f3000da3fad71e0aa2/llvmlite-0.34.0.tar.gz

Building wheels for collected packages: llvmlite

  Running setup.py bdist_wheel for llvmlite ... error

  Complete output from command /media/Projects/outliers/.venv/bin/python3 -u -c "import setuptools, tokenize;__file__='/tmp/pip-build-a4jzbt70/llvmlite/setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('

', '

');f.close();exec(compile(code, __file__, 'exec'))" bdist_wheel -d /tmp/tmpzu8welrdpip-wheel- --python-tag cp36:

  running bdist_wheel

  /media/Projects/outliers/.venv/bin/python3 /tmp/pip-build-a4jzbt70/llvmlite/ffi/build.py

  LLVM version... 6.0.0

  

  Traceback (most recent call last):

    File "/tmp/pip-build-a4jzbt70/llvmlite/ffi/build.py", line 191, in <module>

      main()

    File "/tmp/pip-build-a4jzbt70/llvmlite/ffi/build.py", line 181, in main

      main_posix('linux', '.so')

    File "/tmp/pip-build-a4jzbt70/llvmlite/ffi/build.py", line 143, in main_posix

      raise RuntimeError(msg)

  RuntimeError: Building llvmlite requires LLVM 10.0.x or 9.0.x, got '6.0.0'. Be sure to set LLVM_CONFIG to the right executable path.

  Read the documentation at http://llvmlite.pydata.org/ for more information about building llvmlite.

  

  error: command '/media/Projects/outliers/.venv/bin/python3' failed with exit status 1

  

  ----------------------------------------

  Failed building wheel for llvmlite

  Running setup.py clean for llvmlite

Failed to build llvmlite

Installing collected packages: llvmlite

  Running setup.py install for llvmlite ... error

    Complete output from command /media/Projects/outliers/.venv/bin/python3 -u -c "import setuptools, tokenize;__file__='/tmp/pip-build-a4jzbt70/llvmlite/setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('

', '

');f.close();exec(compile(code, __file__, 'exec'))" install --record /tmp/pip-xelmdsmd-record/install-record.txt --single-version-externally-managed --compile --install-headers /media/Projects/outliers/.venv/include/site/python3.6/llvmlite:

    running install

    running build

    got version from file /tmp/pip-build-a4jzbt70/llvmlite/llvmlite/_version.py {'version': '0.34.0', 'full': 'c5889c9e98c6b19d5d85ebdd982d64a03931f8e2'}

    running build_ext

    /media/Projects/outliers/.venv/bin/python3 /tmp/pip-build-a4jzbt70/llvmlite/ffi/build.py

    LLVM version... 6.0.0

    

    Traceback (most recent call last):

      File "/tmp/pip-build-a4jzbt70/llvmlite/ffi/build.py", line 191, in <module>

        main()

      File "/tmp/pip-build-a4jzbt70/llvmlite/ffi/build.py", line 181, in main

        main_posix('linux', '.so')

      File "/tmp/pip-build-a4jzbt70/llvmlite/ffi/build.py", line 143, in main_posix

        raise RuntimeError(msg)

    RuntimeError: Building llvmlite requires LLVM 10.0.x or 9.0.x, got '6.0.0'. Be sure to set LLVM_CONFIG to the right executable path.

    Read the documentation at http://llvmlite.pydata.org/ for more information about building llvmlite.

    

    error: command '/media/Projects/outliers/.venv/bin/python3' failed with exit status 1

    

    ----------------------------------------

Command "/media/Projects/outliers/.venv/bin/python3 -u -c "import setuptools, tokenize;__file__='/tmp/pip-build-a4jzbt70/llvmlite/setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('

', '

');f.close();exec(compile(code, __file__, 'exec'))" install --record /tmp/pip-xelmdsmd-record/install-record.txt --single-version-externally-managed --compile --install-headers /media/Projects/outliers/.venv/include/site/python3.6/llvmlite" failed with error code 1 in /tmp/pip-build-a4jzbt70/llvmlite/

I believe the most important line is this:

RuntimeError: Building llvmlite requires LLVM 10.0.x or 9.0.x, got '6.0.0'. Be sure to set LLVM_CONFIG to the right executable path.

If one tries to update it, it says 6.X is the newest:

user@desktop:~$ apt install llvm

Reading package lists... Done

Building dependency tree       

Reading state information... Done

llvm is already the newest version (1:6.0-41~exp5~ubuntu1).

The following packages were automatically installed and are no longer required:

  boinc-client golang-1.10-go golang-1.10-src golang-src libboinc7 libgsoap-2.8.60 libllvm10 libllvm10:i386 libnvidia-cfg1-440 libnvidia-common-435 libnvidia-common-440

  libnvidia-compute-440 libnvidia-decode-440 libnvidia-ifr1-440 libvncserver1 linux-headers-4.15.0-106 linux-headers-4.15.0-106-generic linux-headers-4.15.0-115

  linux-headers-4.15.0-115-generic linux-headers-5.4.0-45-generic linux-hwe-5.4-headers-5.4.0-45 python-fasteners python-monotonic python-pexpect python-ptyprocess

Use 'sudo apt autoremove' to remove them.

0 upgraded, 0 newly installed, 0 to remove and 15 not upgraded.

I have also tried 1) using their apt deb sources (didn't work, nothing happens when added, latest version is still 6.X when using apt upgrade), and 2) downloading their files (no instructions given how to install).