rocm's ClangConfig.cmake sets Clang_FOUND to FALSE

Description:

I'm trying to build the 6.0.0-1 package, but it fails to detect clang. I have rocm-llvm from testing installed. I also do have regular clang and clang15 installed.

CMake Error at hipamd/src/hiprtc/CMakeLists.txt:126 (find_package):
  Found package configuration file:

    /opt/rocm/llvm/lib/cmake/clang/ClangConfig.cmake

  but it set Clang_FOUND to FALSE so package "Clang" is considered to be NOT
  FOUND.  Reason given by package:

  The following imported targets are referenced, but are missing:
  LLVMTargetParser LLVMFrontendOpenMP LLVMMC LLVMMCParser LLVMBinaryFormat
  LLVMCore LLVMFrontendHLSL LLVMAnalysis LLVMBitReader LLVMBitWriter
  LLVMCoroutines LLVMCoverage LLVMExtensions LLVMipo LLVMIRPrinter
  LLVMIRReader LLVMAggressiveInstCombine LLVMInstCombine LLVMInstrumentation
  LLVMLTO LLVMLinker LLVMObjCARCOpts LLVMObject LLVMPasses LLVMProfileData
  LLVMRemarks LLVMScalarOpts LLVMTarget LLVMTransformUtils LLVMOption
  LLVMWindowsDriver LLVMBitstreamReader LLVMAMDGPUCodeGen LLVMAMDGPUAsmParser
  LLVMAMDGPUDesc LLVMAMDGPUDisassembler LLVMAMDGPUInfo LLVMAMDGPUUtils
  LLVMNVPTXCodeGen LLVMNVPTXDesc LLVMNVPTXInfo LLVMX86CodeGen
  LLVMX86AsmParser LLVMX86Desc LLVMX86Disassembler LLVMX86Info LLVMOrcJIT
  LLVMCodeGen LLVMExecutionEngine LLVMMCJIT LLVMRuntimeDyld LLVMSelectionDAG

Additional info:

• package version(s): 6.0.0-1
• config and/or log files:
• link to upstream bug report, if any:

Steps to reproduce:

1. Clone https://gitlab.archlinux.org/archlinux/packaging/packages/hip-runtime-amd.git
2. Run makepkg