diff --git a/bsc/llvm-ompss2/default.nix b/bsc/llvm-ompss2/default.nix
index e5653a4..70dae67 100644
--- a/bsc/llvm-ompss2/default.nix
+++ b/bsc/llvm-ompss2/default.nix
@@ -8,26 +8,44 @@
 , perl
 , clang
 , which
+, libelf
+, libffi
+, pkg-config
+, enableDebug ? false
 }:
 
 stdenv.mkDerivation rec {
   version = "10.0.0";
   name = "llvm-ompss2-${version}";
   enableParallelBuilding = true;
-  buildInputs = [ which clang bash python3 perl cmake lld ];
-  #preConfigure = ''
-  #  ls
-  #  cmakeFlagsArray=(
-  #    "-DCMAKE_C_COMPILER=mpicc"
-  #    "-DCMAKE_CXX_COMPILER=mpic++"
-  #  )
-  #'';
 
-  # FIXME: The setup script installs into /build/source/llvm-install
-  configurePhase = ''
-    mkdir llvm-build
-    cd llvm-build
-    env bash ../utils/OmpSs/setup-cmake.sh
+  buildInputs = [
+    which
+    clang
+    bash
+    python3
+    perl
+    cmake
+    lld
+    libelf
+    libffi
+    pkg-config
+  ];
+  cmakeBuildType = if enableDebug then "Debug" else "Release";
+  dontUseCmakeBuildDir = true;
+  preConfigure = ''
+    mkdir -p build
+    cd build
+    cmakeDir="../llvm"
+    cmakeFlagsArray=(
+      "-DLLVM_ENABLE_LLD=ON"
+      "-DCMAKE_CXX_FLAGS_DEBUG=-g -ggnu-pubnames"
+      "-DCMAKE_EXE_LINKER_FLAGS_DEBUG=-Wl,-gdb-index"
+      "-DLLVM_LIT_ARGS=-sv --xunit-xml-output=xunit.xml"
+      "-DLLVM_ENABLE_PROJECTS=clang;openmp"
+      "-DLLVM_INSTALL_UTILS=ON"
+      "-DLLVM_ENABLE_ASSERTIONS=ON"
+    )
   '';
 
   src = builtins.fetchGit {