diff --git a/lib/clang/clang.pre.mk b/lib/clang/clang.pre.mk
new file mode 100644
index 00000000000..fee5b3581f8
--- /dev/null
+++ b/lib/clang/clang.pre.mk
@@ -0,0 +1,7 @@
+# $FreeBSD$
+
+.include "llvm.pre.mk"
+
+CLANG_SRCS=	${LLVM_SRCS}/tools/clang
+
+CLANG_TBLGEN?=	clang-tblgen
diff --git a/lib/clang/llvm.pre.mk b/lib/clang/llvm.pre.mk
new file mode 100644
index 00000000000..5fd5b121e22
--- /dev/null
+++ b/lib/clang/llvm.pre.mk
@@ -0,0 +1,5 @@
+# $FreeBSD$
+
+LLVM_SRCS=	${.CURDIR}/../../../contrib/llvm
+
+LLVM_TBLGEN?=	llvm-tblgen