CMake build fails due to missing `bitnet-lut-kernels.h`

[lost-clouds]

Hi,

I am trying to build BitNet from a clean clone using CMake, but the native C++ build fails due to a missing header file.

Steps to reproduce

git clone --recursive https://github.com/microsoft/BitNet.git
cd BitNet
git submodule update --init --recursive
cmake -B build

Observed behavior

CMake fails while configuring the project in:

3rdparty/llama.cpp/ggml/src/CMakeLists.txt

with the following error:

CMake Error at 3rdparty/llama.cpp/ggml/src/CMakeLists.txt:1324 (add_library):
  Cannot find source file:

    ../../../../include/bitnet-lut-kernels.h

  Tried extensions .c .C .c++ .cc .cpp .cxx .cu .mpp .m .M .mm .ixx .cppm
  .ccm .cxxm .c++m .h .hh .h++ .hm .hpp .hxx .in .txx .f .F .for .f77 .f90
  .f95 .f03 .hip .ispc

CMake Error at 3rdparty/llama.cpp/ggml/src/CMakeLists.txt:1324 (add_library):
  No SOURCES given to target: ggml

CMake Generate step failed. Build files cannot be regenerated correctly.

Analysis

The file:

include/bitnet-lut-kernels.h

does not exist in the repository, and I could not find any script or build step that generates this header automatically.

For reference, I am able to build llama.cpp successfully using the same toolchain and a similar CMake workflow, so I am unsure whether this is:

• a missing generated file,
• an incomplete submodule,
• or a build step that I am overlooking.

Environment

• Platform: Android / Termux (aarch64)
• Compiler: Clang 21.1.8
• CMake: invoked directly via cmake -B build

I am still a beginner, so apologies if this is a trivial question. Any guidance would be greatly appreciated.

Thank you for your time.

and all the log

~/BitNet $ cmake -B build
-- The C compiler identification is Clang 21.1.8
-- The CXX compiler identification is Clang 21.1.8
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: /data/data/com.termux/files/usr/bin/cc - skipped
-- Detecting C compile features
-- Detecting C compile features - done
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: /data/data/com.termux/files/usr/bin/c++ - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Performing Test CMAKE_HAVE_LIBC_PTHREAD
-- Performing Test CMAKE_HAVE_LIBC_PTHREAD - Failed
-- Check if compiler accepts -pthread
-- Check if compiler accepts -pthread - yes
-- Found Threads: TRUE
-- Found Git: /data/data/com.termux/files/usr/bin/git (found version "2.52.0")
-- Found OpenMP_C: -fopenmp=libomp (found version "5.1")
-- Found OpenMP_CXX: -fopenmp=libomp (found version "5.1")
-- Found OpenMP: TRUE (found version "5.1")
-- OpenMP found
-- Using llamafile
-- ccache found, compilation results will be cached. Disable with GGML_CCACHE=OFF.
-- CMAKE_SYSTEM_PROCESSOR: aarch64
-- ARM detected
-- Performing Test COMPILER_SUPPORTS_FP16_FORMAT_I3E
-- Performing Test COMPILER_SUPPORTS_FP16_FORMAT_I3E - Failed
-- Configuring done (3.4s)
CMake Error at 3rdparty/llama.cpp/ggml/src/CMakeLists.txt:1324 (add_library):
  Cannot find source file:

    ../../../../include/bitnet-lut-kernels.h

  Tried extensions .c .C .c++ .cc .cpp .cxx .cu .mpp .m .M .mm .ixx .cppm
  .ccm .cxxm .c++m .h .hh .h++ .hm .hpp .hxx .in .txx .f .F .for .f77 .f90
  .f95 .f03 .hip .ispc


CMake Error at 3rdparty/llama.cpp/ggml/src/CMakeLists.txt:1324 (add_library):
  No SOURCES given to target: ggml


CMake Generate step failed.  Build files cannot be regenerated correctly.