diff --git a/flake.lock b/flake.lock
index 46aeb0e..f93c442 100644
--- a/flake.lock
+++ b/flake.lock
@@ -1,12 +1,15 @@
 {
   "nodes": {
     "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
       "locked": {
-        "lastModified": 1667395993,
-        "narHash": "sha256-nuEHfE/LcWyuSWnS8t12N1wc105Qtau+/OdUAjtQ0rA=",
+        "lastModified": 1687709756,
+        "narHash": "sha256-Y5wKlQSkgEK2weWdOu4J3riRd+kV/VCgHsqLNTTWQ/0=",
         "owner": "numtide",
         "repo": "flake-utils",
-        "rev": "5aed5285a952e0b949eb3ba02c12fa4fcfef535f",
+        "rev": "dbabf0ca0c0c4bce6ea5eaf65af5cb694d2082c7",
         "type": "github"
       },
       "original": {
@@ -17,18 +20,16 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1672505534,
-        "narHash": "sha256-ntaHfT53P4DtP3nW2mTmq5MQP3gqeut+ByPLHRkipcc=",
-        "owner": "bgamari",
+        "lastModified": 1687886075,
+        "narHash": "sha256-PeayJDDDy+uw1Ats4moZnRdL1OFuZm1Tj+KiHlD67+o=",
+        "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "48dcea17d21e1b7ebcda2baa9fa2ea1beef00a3d",
+        "rev": "a565059a348422af5af9026b5174dc5c0dcefdae",
         "type": "github"
       },
       "original": {
-        "owner": "bgamari",
-        "ref": "wip/vtk-egg-info",
-        "repo": "nixpkgs",
-        "type": "github"
+        "id": "nixpkgs",
+        "type": "indirect"
       }
     },
     "openfoam": {
@@ -49,6 +50,21 @@
         "nixpkgs": "nixpkgs",
         "openfoam": "openfoam"
       }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
     }
   },
   "root": "root",
diff --git a/flake.nix b/flake.nix
index 492c28e..2101032 100644
--- a/flake.nix
+++ b/flake.nix
@@ -3,7 +3,7 @@
 
   inputs.flake-utils.url = "github:numtide/flake-utils";
 
-  inputs.nixpkgs.url = "github:bgamari/nixpkgs/wip/vtk-egg-info";
+  #inputs.nixpkgs.url = "github:bgamari/nixpkgs/wip/vtk-egg-info";
 
   inputs.openfoam = {
     url = "https://develop.openfoam.com/Development/openfoam/-/archive/OpenFOAM-v2212/openfoam-OpenFOAM-v2212.tar.gz";
diff --git a/openfoam.nix b/openfoam.nix
index af733dd..f9b2e03 100644
--- a/openfoam.nix
+++ b/openfoam.nix
@@ -1,7 +1,7 @@
 {
   stdenv, src,
   bash, m4, flex, bison,
-  fftw, mpi, scotch, boost, cgal, zlib
+  fftw, mpi, scotch, boost, cgal, zlib, pkg-config, gmp, cmake,  python3
 }:
 
 stdenv.mkDerivation {
@@ -9,8 +9,8 @@ stdenv.mkDerivation {
 
   inherit src;
 
-  nativeBuildInputs = [ bash m4 flex bison ];
-  buildInputs = [ fftw mpi scotch boost cgal zlib ];
+  nativeBuildInputs = [ bash m4 flex bison pkg-config cmake ];
+  buildInputs = [ fftw mpi scotch boost cgal zlib gmp ];
 
   patches = [ ./fix-bash.patch ];
   postPatch = ''
@@ -24,52 +24,11 @@ stdenv.mkDerivation {
     do
       substituteInPlace $f --replace /bin/bash ${bash}/bin/bash
     done
+    cp ../bashrc etc/bashrc
   '';
 
-  configurePhase = ''
-    set -x
-    build="$(pwd)"
-    export FOAM_APP=$build/applications
-    export FOAM_SOLVERS=$build/applications/solvers
-    export FOAM_APPBIN=$build/platforms/linux64Gcc/bin
-    export FOAM_LIBBIN=$build/platforms/linux64Gcc/lib
-    export FOAM_EXT_LIBBIN=$build/platforms/linux64Gcc/lib
-    export FOAM_MPI=openmpi-system
-    export FOAM_RUN=$build/run
-    export FOAM_SRC=$build/src
-    export FOAM_ETC=$build/etc
-    export FOAM_USER_APPBIN=$build/platforms/linux64Gcc/bin
-    export FOAM_USER_LIBBIN=$build/platforms/linux64Gcc/lib
-    export FOAM_EXTRA_CXXFLAGS="-DFOAM_CONFIGURED_PROJECT_DIR=\\\"${placeholder "out"}\\\""
-    export MPI_ARCH_PATH=/usr/include/openmpi
-    export WM_ARCH=linux64
-    export WM_LABEL_SIZE=32
-    export WM_LABEL_OPTION=Int32
-    export WM_COMPILER=Gcc
-    export WM_COMPILER_LIB_ARCH=64
-    export WM_COMPILE_OPTION=Opt
-    export WM_DIR=$build/wmake
-    export WM_OPTIONS=linux64Gcc
-    export WM_PRECISION_OPTION=DP
-    export WM_PROJECT=OpenFOAM
-    export WM_PROJECT_DIR=$build
-    export WM_PROJECT_USER_DIR=$build/debian/tmp
-    export WM_PROJECT_VERSION="$(bin/foamEtcFile -show-api)"
-    export WM_NCOMPPROCS=$CORES
-    export gperftools_install=$build/platforms/linux64Gcc
-    export WM_MPLIB=SYSTEMOPENMPI
-    unset FOAMY_HEX_MESH
-
-    bin/tools/foamConfigurePaths \
-        -boost boost-system \
-        -cgal  cgal-system \
-        -fftw  fftw-system \
-        -kahip kahip-none \
-        -scotch scotch-system
-  '';
   buildPhase = ''
-    LD_LIBRARY_PATH="$LD_LIBRARY_PATH:$build/platforms/linux64Gcc/lib/openmpi-system:$build/platforms/linux64Gcc/lib:$build/platforms/linux64Gcc/lib/dummy" \
-      PATH="$PATH:$build/wmake" \
+      source etc/bashrc
       ./Allwmake -j$CORES -q
   '';
   installPhase = ''