diff --git a/llvm/labs.h b/llvm/labs.h
new file mode 100644
index 0000000..3dbde5c
--- /dev/null
+++ b/llvm/labs.h
@@ -0,0 +1,7 @@
+#include <cstdlib>
+
+namespace std {
+	static inline long abs(long a) { return std::labs(a); }
+	static inline long long abs(long long a) { return std::labs(a); }
+}
+
diff --git a/llvm/recipe.spec b/llvm/recipe.spec
index ac95051..a520c4a 100644
--- a/llvm/recipe.spec
+++ b/llvm/recipe.spec
@@ -1,14 +1,19 @@
 name: llvm
 version: 8.0.1
 release: 2
-sources: https://github.com/llvm/llvm-project/releases/download/llvmorg-%{version}/llvm-%{version}.src.tar.xz
+sources:
+	- https://github.com/llvm/llvm-project/releases/download/llvmorg-%{version}/llvm-%{version}.src.tar.xz
+	- labs.h
+
 dependencies:
 	- libffi
+	- libcxx
 
-build-dependencies: python
+build-dependencies: python, libcxx-dev
 
 @configure
 	mkdir %{name}-%{version}
+
 	cd %{name}-%{version} && \
 		cmake ../llvm-%{version}.src \
 		-DCMAKE_INSTALL_PREFIX="%{prefix}" \
@@ -19,7 +24,6 @@ build-dependencies: python
 		-DLLVM_ENABLE_ASSERTIONS=OFF \
 		-DLLVM_ENABLE_CXX1Y=ON \
 		-DLLVM_ENABLE_FFI=ON \
-		-DLLVM_ENABLE_LIBCXX=OFF \
 		-DLLVM_ENABLE_PIC=ON \
 		-DLLVM_ENABLE_RTTI=ON \
 		-DLLVM_ENABLE_SPHINX=OFF \
@@ -28,8 +32,11 @@ build-dependencies: python
 		-DLLVM_INCLUDE_EXAMPLES=OFF \
 		-DLLVM_LINK_LLVM_DYLIB=ON \
 		-DCMAKE_BUILD_TYPE=Release \
-		-DCMAKE_CXX_FLAGS="-fPIC -O2" \
-		-DCMAKE_C_FLAGS="-fPIC -O2"
+		-DLLVM_ENABLE_LIBCXX=ON \
+		-DCMAKE_CXX_COMPILER="clang++" \
+		-DCMAKE_CXX_FLAGS="$CXXFLAGS -stdlib=libc++ -include /usr/weirdos/include/c++/v1/math.h -include $(pwd)/../labs.h -D__DEFINED_max_align_t" \
+		-DCMAKE_C_FLAGS="$CFLAGS" \
+		-DCMAKE_LD_FLAGS="$LDFLAGS -lc++"
 
 	# when llvm-8 won't be the lastest LLVM version anymore
 	# -DCMAKE_INSTALL_PREFIX=/usr/bad/%{name}