diff --git a/.gitignore b/.gitignore
index 30f0f45..be219d0 100644
--- a/.gitignore
+++ b/.gitignore
@@ -7,3 +7,4 @@ __pycache__/
 extractor.so
 .coverage
 html/
+dist/
diff --git a/CMakeLists.txt b/CMakeLists.txt
index bdd2464..a3d77e3 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -25,7 +25,7 @@ message(STATUS "Found LLVM ${LLVM_PACKAGE_VERSION}")
 message(STATUS "Using LLVMConfig.cmake in: ${LLVM_DIR}")
 
 if(("${LLVM_PACKAGE_VERSION}" VERSION_LESS 9.0.0)
-   OR ("${LLVM_PACKAGE_VERSION}" VERSION_GREATER 11))
+   OR ("${LLVM_PACKAGE_VERSION}" VERSION_GREATER_EQUAL 12))
   message(FATAL_ERROR "Unsupported LLVM version: ${LLVM_PACKAGE_VERSION}")
 endif()
 
diff --git a/MANIFEST.in b/MANIFEST.in
new file mode 100644
index 0000000..3b653d6
--- /dev/null
+++ b/MANIFEST.in
@@ -0,0 +1,4 @@
+include transformer/*.cpp
+include transformer/*.h
+include CMakeLists.txt
+include dev-requirements.txt