Got the thing to build using a vendored LLVM

src/compiler.cpp

@@ -10,7 +10,7 @@
 #include <llvm/Target/TargetOptions.h>
 #include <llvm/Support/Host.h>
 #include <llvm/Support/TargetSelect.h>
-#include <llvm/Support/TargetRegistry.h>
+#include <llvm/MC/TargetRegistry.h>
 #include <llvm/IR/LegacyPassManager.h>
 #include <llvm/Transforms/IPO/PassManagerBuilder.h>
 #include <llvm/Transforms/InstCombine/InstCombine.h>

src/runtime.cpp

@@ -3,7 +3,9 @@
 //
 
 #include "runtime.hpp"
+
 #include <llvm/IR/LegacyPassManager.h>
+#include <llvm/Pass.h>
 #include <llvm/Transforms/InstCombine/InstCombine.h>
 #include <llvm/Transforms/Scalar.h>
 #include <llvm/Transforms/Scalar/GVN.h>