diff --git a/packages/llvm-project/pkgbuild.py b/packages/llvm-project/pkgbuild.py
index a33558a..10eee45 100644
--- a/packages/llvm-project/pkgbuild.py
+++ b/packages/llvm-project/pkgbuild.py
@@ -130,6 +130,7 @@ def build_clang():
         "-DCLANG_DEFAULT_CXX_STDLIB=libc++",
         "-DCLANG_DEFAULT_RTLIB=compiler-rt",
         "-DLLVM_INCLUDE_TESTS=OFF",
+        f"-DC_INCLUDE_DIRS=/lib/{arch.get_target()}/include",
     ]
     cmake("clang", import_llvm() + options)
 
@@ -143,7 +144,7 @@ def build_polly():
     cmake("polly", import_llvm())
 
 def build_runtimes():
-    cflags = f"-isystem /lib/{arch.get_target()}/include -L/lib/{arch.get_target()} -B/lib/{arch.get_target()} -rtlib=compiler-rt"
+    os.makedirs("../_build_runtimes", exist_ok=True)
     shutil.rmtree("../_build_runtimes")
     options = [
         # Configure runtimes
@@ -187,6 +188,7 @@ dep("semi-libc @same-arch")
 dep("libunwind @same-arch")
 dep("libcxx @same-arch")
 dep("libcxxabi @same-arch")
+dep("libffi @same-arch")
 on_pack(lambda composer: auto_pack_glob(composer, ["lib/*.so*"]))
 
 package("libllvm-dev")
@@ -249,9 +251,6 @@ def pack_clang(composer):
         lrtlib = rtlib.replace(f"-{larch}", "")
         composer.addfile(f"{linuxrtdir}/{rtlib}", f"{localrtdir}/{lrtlib}")
 
-    # Add symlink to system directories
-    os.symlink(f"/lib/{arch.get_target()}/include", f"{composer.workdir}/bundle/include")
-
     # Add configuration
     clang_cfg = f"-L/lib/{arch.get_target()}\n-B/lib/{arch.get_target()}\n-rtlib=compiler-rt\n"
     clangxx_cfg = f"-stdlib=libc++\n{clang_cfg}"