diff --git a/pkgs/development/ocaml-modules/llvm/default.nix b/pkgs/development/ocaml-modules/llvm/default.nix
index 351a773a6f7..3bced92cc3e 100644
--- a/pkgs/development/ocaml-modules/llvm/default.nix
+++ b/pkgs/development/ocaml-modules/llvm/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, python, llvm, ocaml, findlib, ctypes }:
+{ stdenv, fetchpatch, python, cmake, llvm, ocaml, findlib, ctypes }:
 
 let version = stdenv.lib.getVersion llvm; in
 
@@ -7,21 +7,23 @@ stdenv.mkDerivation {
 
   inherit (llvm) src;
 
-  buildInputs = [ python llvm ocaml findlib ctypes ];
+  buildInputs = [ python cmake llvm ocaml findlib ctypes ];
 
-  configurePhase = ''
-    mkdir build
-    cd build
-    ../configure --disable-compiler-version-checks --prefix=$out \
-    --disable-doxygen --disable-docs --with-ocaml-libdir=$OCAMLFIND_DESTDIR/llvm \
-    --enable-static
-    '';
+  patches = [ (fetchpatch {
+    url = https://raw.githubusercontent.com/ocaml/opam-repository/master/packages/llvm/llvm.3.9/files/cmake.patch;
+    sha256 = "1fcc6ylfiw1npdhx7mrsj7h0dx7cym7i9664kpr76zqazb52ikm9";
+  })];
 
-  enableParallelBuilding = false;
+  cmakeFlags = [ "-DLLVM_OCAML_OUT_OF_TREE=TRUE" ];
 
-  makeFlags = [ "-C bindings" "SYSTEM_LLVM_CONFIG=llvm-config" ];
+  buildFlags = "ocaml_all";
+
+  installFlags = "-C bindings/ocaml";
 
   postInstall = ''
+    mv $out/lib/ocaml $out/ocaml
+    mkdir -p $OCAMLFIND_DESTDIR/
+    mv $out/ocaml $OCAMLFIND_DESTDIR/llvm
     mv $OCAMLFIND_DESTDIR/llvm/META{.llvm,}
   '';
 
diff --git a/pkgs/top-level/ocaml-packages.nix b/pkgs/top-level/ocaml-packages.nix
index f3f535bb085..bb4d2abed22 100644
--- a/pkgs/top-level/ocaml-packages.nix
+++ b/pkgs/top-level/ocaml-packages.nix
@@ -261,7 +261,7 @@ let
       else lambdaTerm-1_6;
 
     llvm = callPackage ../development/ocaml-modules/llvm {
-      llvm = pkgs.llvm_37;
+      llvm = pkgs.llvm_39;
     };
 
     logs = callPackage ../development/ocaml-modules/logs {