diff --git a/llvm-project/Dockerfile.libc b/llvm-project/Dockerfile.libc
new file mode 100644
index 0000000..566114c
--- /dev/null
+++ b/llvm-project/Dockerfile.libc
@@ -0,0 +1,22 @@
+FROM docker.io/alpine:edge as source
+RUN wget --no-clobber \
+  https://github.com/llvm/llvm-project/releases/download/llvmorg-17.0.6/llvm-project-17.0.6.src.tar.xz
+
+FROM docker.io/alpine:edge AS stage_one
+
+COPY --from=source llvm-project-17.0.6.src.tar.xz /
+RUN tar xf llvm-project-17.0.6.src.tar.xz && \
+  mv llvm-project-17.0.6.src llvm-project
+
+RUN apk add cmake ninja clang python3 lld
+
+COPY libc.cmake llvm-project/.
+ARG LLVM_BUILD_DIR=llvm-project/llvm/build
+
+RUN apk add linux-headers
+
+RUN cmake \
+  -B ${LLVM_BUILD_DIR} \
+  -C llvm-project/libc.cmake \
+  -S llvm-project/llvm \
+  -G Ninja
diff --git a/llvm-project/Makefile b/llvm-project/Makefile
index b382112..45fd2a8 100644
--- a/llvm-project/Makefile
+++ b/llvm-project/Makefile
@@ -9,7 +9,7 @@ IMAGE ?= ghcr.io/clangbuiltlinux/llvm-project
 
 dotfiles: stage2.svg stage1.svg
 
-.PHONY: clang epoch1 epoch2 epoch3
+.PHONY: clang epoch1 epoch2 epoch3 libc
 
 # Argument 1: epoch# (e.g., epoch1; should match the suffix of the Dockerfile)
 # Argument 2: Tag (e.g., ghcr.io/clangbuiltlinux/llvm-project:stage2-x86_64)
@@ -35,5 +35,10 @@ clang: epoch3
 	$(DOCKER) create --name llvm-project $(IMAGE):stage3-$(HOST_ARCH)
 	$(DOCKER) cp llvm-project:/usr/local/bin/clang-14 clang
 
+libc:
+	$(DOCKER) rm libc || true
+	# $(DOCKER) create --name libc libc-$(HOST_ARCH)
+	$(DOCKER) build --file Dockerfile.libc . --tag libc
+
 test: epoch3
 	bash ../ci/test-clang.sh $(IMAGE):stage3-$(HOST_ARCH)
diff --git a/llvm-project/libc.cmake b/llvm-project/libc.cmake
new file mode 100644
index 0000000..5f37fe9
--- /dev/null
+++ b/llvm-project/libc.cmake
@@ -0,0 +1,17 @@
+# Use Alpine's clang and clang++ from their clang package as the stage0
+# compilers.
+set(CMAKE_CXX_COMPILER "/usr/bin/clang++" CACHE FILEPATH "")
+set(CMAKE_C_COMPILER "/usr/bin/clang" CACHE FILEPATH "")
+set(CMAKE_BUILD_TYPE "Debug" CACHE STRING "")
+
+# Use Alpine's lld as the stage0 linker to link everything.
+set(LLVM_ENABLE_LLD ON CACHE BOOL "")
+
+# TODO: why does clang need to be enabled?
+set(LLVM_ENABLE_PROJECTS "clang;compiler-rt;libc;" CACHE STRING "")
+
+set(LLVM_LIBC_FULL_BUILD ON CACHE BOOL "")
+set(LLVM_LIBC_INCLUDE_SCUDO ON CACHE BOOL "")
+set(COMPILER_RT_BUILD_SCUDO_STANDALONE_WITH_LLVM_LIBC ON CACHE BOOL "")
+set(COMPILER_RT_BUILD_GWP_ASAN OFF CACHE BOOL "")
+set(COMPILER_RT_SCUDO_STANDALONE_BUILD_SHARED OFF CACHE BOOL "")