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conan install llvm/13.0.0@ --build=llvm --profile=/home/conan/w/BuildSingleReference/80725/d251426a-5f20-4b36-aa5e-d5a78f35ce43/profile.txt
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Configuration:
[settings]
arch=x86_64
build_type=Release
compiler=gcc
compiler.libcxx=libstdc++11
compiler.version=10
os=Linux
[options]
[build_requires]
[env]

llvm/13.0.0: Forced build from source
Installing package: llvm/13.0.0
Requirements
    llvm/13.0.0 from local cache - Cache
Packages
    llvm/13.0.0:6c633d857ce4d12f8149e83583bdfcfd06e86384 - Build
Build requirements
    cmake/3.21.3 from 'conan-center' - Cache
    openssl/1.1.1l from 'conan-center' - Cache
Build requirements packages
    cmake/3.21.3:5c09c752508b674ca5cb1f2d327b5a2d582866c8 - Cache
    openssl/1.1.1l:19729b9559f3ae196cad45cb2b97468ccb75dcd1 - Cache

Installing (downloading, building) binaries...
openssl/1.1.1l: Already installed!
[HOOK - conan-center.py] post_package_info(): [CMAKE FILE NOT IN BUILD FOLDERS (KB-H019)] OK
[HOOK - conan-center.py] post_package_info(): [LIBRARY DOES NOT EXIST (KB-H054)] OK
cmake/3.21.3: Already installed!
cmake/3.21.3: Appending PATH environment variable: /home/conan/w/BuildSingleReference/.conan/data/cmake/3.21.3/_/_/package/5c09c752508b674ca5cb1f2d327b5a2d582866c8/bin
[HOOK - conan-center.py] post_package_info(): [CMAKE FILE NOT IN BUILD FOLDERS (KB-H019)] OK
[HOOK - conan-center.py] post_package_info(): [LIBRARY DOES NOT EXIST (KB-H054)] OK
llvm/13.0.0: Applying build-requirement: cmake/3.21.3
llvm/13.0.0: Applying build-requirement: openssl/1.1.1l
llvm/13.0.0: Building your package in /home/conan/w/BuildSingleReference/.conan/data/llvm/13.0.0/_/_/build/6c633d857ce4d12f8149e83583bdfcfd06e86384
llvm/13.0.0: Generator cmake_find_package created Findcmake.cmake
llvm/13.0.0: Generator cmake_find_package created FindOpenSSL.cmake
llvm/13.0.0: Aggregating env generators
[HOOK - conan-center.py] pre_build(): [FPIC MANAGEMENT (KB-H007)] OK. 'fPIC' option found and apparently well managed
[HOOK - conan-center.py] pre_build(): [FPIC MANAGEMENT (KB-H007)] OK
llvm/13.0.0: Calling build()
llvm/13.0.0: Enabled LLVM subprojects: clang, compiler-rt
llvm/13.0.0: 
llvm/13.0.0: WARN: Build folder is dirty, removing it: /home/conan/w/BuildSingleReference/.conan/data/llvm/13.0.0/_/_/build/6c633d857ce4d12f8149e83583bdfcfd06e86384
llvm/13.0.0: ERROR: Package '6c633d857ce4d12f8149e83583bdfcfd06e86384' build failed
llvm/13.0.0: WARN: Build folder /home/conan/w/BuildSingleReference/.conan/data/llvm/13.0.0/_/_/build/6c633d857ce4d12f8149e83583bdfcfd06e86384
ERROR: llvm/13.0.0: Error in build() method, line 93
	cmake = self._cmake_configure()
while calling '_cmake_configure', line 79
	with open(cmakelists, 'a') as f:
	FileNotFoundError: [Errno 2] No such file or directory: 'source_subfolder/llvm/CMakeLists.txt'