rpcs3 cmake error

I had a false positive, I still have the same error
I ran
git clone https://github.com/RPCS3/rpcs3.git
cd rpcs3
git submodule update --init
It updated this time, downloaded several files
then
cmake CMakeLists.txt
-- The C compiler identification is GNU 4.7.2
-- The CXX compiler identification is GNU 4.7.2
-- Check for working C compiler: /usr/bin/cc
-- Check for working C compiler: /usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Check for working CXX compiler: /usr/bin/c++
-- Check for working CXX compiler: /usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- No build type selected, default to Release

== ====================================================
== [AsmJit Include|Static]
== ====================================================

-- Initializing ASMJIT_DIR=/root/Downloads/rpcs3/asmjit
-- Using GCC
-- cotire 1.6.1 loaded.
-- Initializing RPCS3_SRC_DIR=/root/Downloads/rpcs3/rpcs3
-- Found wxWidgets: TRUE
-- Found OpenGL: /usr/lib/x86_64-linux-gnu/libGL.so
-- Found ZLIB: /usr/lib/x86_64-linux-gnu/libz.so (found version "1.2.7&quot
-- Found OpenAL: /usr/lib/x86_64-linux-gnu/libopenal.so
CMake Error at rpcs3/CMakeLists.txt:76 (find_package):
Could not find a package configuration file provided by "LLVM" with any of
the following names:

LLVMConfig.cmake
llvm-config.cmake

Add the installation prefix of "LLVM" to CMAKE_PREFIX_PATH or set
"LLVM_DIR" to a directory containing one of the above files. If "LLVM"
provides a separate development package or SDK, be sure it has been
installed.


-- Configuring incomplete, errors occurred!
See also "/root/Downloads/rpcs3/CMakeFiles/CMakeOutput.log".

different message but still the same error, where the hell do I find these files ?
LLVMConfig.cmake
llvm-config.cmake
where are these files stored ?

LLVM-Config.cmake seems to be located in \rpcs3\llvm\cmake\modules.

There are no files in llvm, there is no cmake folder and there is no modules folder.
why are those files missing ?

---

am I supposed to get all missing files by running
git submodule update --init
?
because the llvm folder is empty, I will try to download from https://github.com/llvm-mirror/ and put the files there manually.

What version of Git are you using and on what operating system?