The imported target "clangBasic" references the file libclangBasic.a but this file does not exist

[Wheest]

I've recently got back into working with C++, and was prompted to run M-x install-irony-server. I'm on Debian 11 bullseye. I was able to fix the issue, below is info for anyone searching the error messages.

I used the default compile flag, and got an error:

-*- mode: compilation; default-directory: "/tmp/build-irony-server-1.6.1/" -*-
Compilation started at Thu Nov 30 11:18:56

cmake -DCMAKE_INSTALL_PREFIX\=/home/user/.emacs.d/.local/cache/irony/  /home/pez/.emacs.d/.local/straight/build-29.1/irony/server && cmake --build . --use-stderr --config Release --target install
CMake Error at /usr/lib/llvm-11/lib/cmake/clang/ClangTargets.cmake:671 (message):
  The imported target "clangBasic" references the file

     "/usr/lib/llvm-11/lib/libclangBasic.a"

  but this file does not exist.  Possible reasons include:

  * The file was deleted, renamed, or moved to another location.

  * An install or uninstall procedure did not complete successfully.

  * The installation package was faulty and contained

     "/usr/lib/llvm-11/lib/cmake/clang/ClangTargets.cmake"

  but not all the files it references.

Call Stack (most recent call first):
  /usr/lib/cmake/clang-11/ClangConfig.cmake:20 (include)
  src/CMakeLists.txt:4 (find_package)

-- Configuring incomplete, errors occurred!

Compilation exited abnormally with code 1 at Thu Nov 30 11:18:56

I could not find a similar issue here.

I think it could be caused by a missing or incomplete installation of Clang on my system, or because the particular version of LLVM/Clang installed does not include the static libraries. If I go to /usr/lib/llvm-11/lib/, there are lots of files there, but not libclangBasic.a

Clang is installed, but libclang-dev was not, which is a pre-requisite for this repo. Installing it and re-running M-x install-irony-server fixed the problem.