diff --git a/contrib/meshgen11_dealii/CMakeLists.txt b/contrib/meshgen11_dealii/CMakeLists.txt
index 3073e50..a5db562 100644
--- a/contrib/meshgen11_dealii/CMakeLists.txt
+++ b/contrib/meshgen11_dealii/CMakeLists.txt
@@ -8,10 +8,10 @@
 ## to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 ## copies of the Software, and to permit persons to whom the Software is
 ## furnished to do so, subject to the following conditions:
-## 
+##
 ## The above copyright notice and this permission notice shall be included in
 ## all copies or substantial portions of the Software.
-## 
+##
 ## THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 ## IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 ## FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
@@ -22,65 +22,39 @@
 ##
 ## ---------------------------------------------------------------------
 
-CMAKE_MINIMUM_REQUIRED(VERSION 3.5.0)
-set(CMAKE_INSTALL_RPATH_USE_LINK_PATH TRUE)
-PROJECT(meshgen11_dealii)
-
-IF(NOT CMAKE_BUILD_TYPE)
-  SET(CMAKE_BUILD_TYPE "DEBUG")
-  #SET(CMAKE_BUILD_TYPE "RELEASE")
-  #SET(CMAKE_BUILD_TYPE "RELWITHDEBINFO")
-  #SET(CMAKE_BUILD_TYPE "MINSIZEREL")
-ENDIF()
-
-# set(DEAL_II_DIR "/home/xywei/apps" CACHE STRING "Deal.II dir")
-# deal.II >= 8.4.1
-FIND_PACKAGE(deal.II REQUIRED
-  HINTS ${DEAL_II_DIR} ../ ../../ $ENV{DEAL_II_DIR} $ENV{CONDA_PREFIX}
-  )
+cmake_minimum_required(VERSION 3.15.0)
+project(meshgen11_dealii LANGUAGES CXX)
 
-DEAL_II_INITIALIZE_CACHED_VARIABLES()
+set(CMAKE_CXX_STANDARD 17 CACHE STRING "C++ version selection")
 
-find_package( PythonInterp 3.8 EXACT )
-find_package( PythonLibs 3.8 EXACT )
+if(NOT CMAKE_BUILD_TYPE)
+    set(CMAKE_BUILD_TYPE "Debug")
+endif()
 
-add_subdirectory(pybind11)
-pybind11_add_module(meshgen11 meshgen.cpp)
-set_target_properties(meshgen11 PROPERTIES PREFIX "")
-set_target_properties(meshgen11 PROPERTIES OUTPUT_NAME "meshgen")
+# deal.II
+find_package(deal.II REQUIRED
+    HINTS ${DEAL_II_DIR} $ENV{DEAL_II_DIR} $ENV{CONDA_PREFIX})
+deal_ii_initialize_cached_variables()
 
-if(FALSE)
-  # This script does not work on current Debian testing
-  DEAL_II_SETUP_TARGET(meshgen11)
-else()
-  SET(_build "RELEASE")
-  STRING(TOLOWER "${CMAKE_BUILD_TYPE}" _cmake_build_type)
-  IF("${_cmake_build_type}" MATCHES "debug")
-    SET(_build "DEBUG")
-  ENDIF()
-  SET_PROPERTY(TARGET meshgen11 APPEND PROPERTY
-    INCLUDE_DIRECTORIES "${DEAL_II_INCLUDE_DIRS}"
-    )
-  SET_PROPERTY(TARGET meshgen11 APPEND PROPERTY
-    INCLUDE_DIRECTORIES "/usr/include/"
-    )
-  SET_PROPERTY(TARGET meshgen11 APPEND_STRING PROPERTY
-    COMPILE_FLAGS "${DEAL_II_CXX_FLAGS} ${DEAL_II_CXX_FLAGS_${_build}}"
-    )
-  SET_PROPERTY(TARGET meshgen11 APPEND_STRING PROPERTY
-    LINK_FLAGS " ${DEAL_II_LINKER_FLAGS} ${DEAL_II_LINKER_FLAGS_${_build}} $ENV{DEAL_II_LINKER_FLAGS}"
-    )
-  SET_PROPERTY(TARGET meshgen11 APPEND PROPERTY
-    COMPILE_DEFINITIONS "${DEAL_II_USER_DEFINITIONS};${DEAL_II_USER_DEFINITIONS_${_build}}"
-    )
-  GET_PROPERTY(_type TARGET meshgen11 PROPERTY TYPE)
-  IF(NOT "${_type}" STREQUAL "OBJECT_LIBRARY")
-    TARGET_LINK_LIBRARIES(meshgen11 PRIVATE ${DEAL_II_TARGET_${_build}})
-  ENDIF()
+# Python
+find_package(Python REQUIRED COMPONENTS Interpreter Development)
+find_package(pybind11 CONFIG)
+if (NOT pybind11_FOUND)
+    add_subdirectory(pybind11)
 endif()
 
-ADD_CUSTOM_COMMAND(TARGET meshgen11 POST_BUILD
-  COMMAND ${CMAKE_COMMAND} -E copy
-  "meshgen.*.so"
-  "meshgen.so"
-  COMMENT "Copied meshgen lib to meshgen.so")
+pybind11_add_module(meshgen11 meshgen.cpp)
+set_target_properties(meshgen11 PROPERTIES
+    OUTPUT_NAME "meshgen"
+    LINK_FLAGS ${DEAL_II_LINKER_FLAGS} ${DEAL_II_LINKER_FLAGS_RELEASE}
+    COMPILE_DEFINITIONS ${DEAL_II_USER_DEFINITIONS}
+    INTERPROCEDURAL_OPTIMIZATION ON
+    VISIBILITY_INLINES_HIDDEN ON)
+target_include_directories(meshgen11 PRIVATE ${DEAL_II_INCLUDE_DIRS})
+target_link_libraries(meshgen11 PRIVATE ${DEAL_II_TARGET_RELEASE})
+
+add_custom_command(TARGET meshgen11 POST_BUILD
+    COMMAND ${CMAKE_COMMAND} -E copy
+    "meshgen.*.so"
+    "meshgen.so"
+    COMMENT "Copied meshgen lib to meshgen.so")
diff --git a/contrib/meshgen11_dealii/README.md b/contrib/meshgen11_dealii/README.md
index 1de97ae..c3e7ec7 100644
--- a/contrib/meshgen11_dealii/README.md
+++ b/contrib/meshgen11_dealii/README.md
@@ -13,9 +13,7 @@ To build `meshgen11`, you need:
 ## Usage
 
 The script `build.sh` also copies the built library to voluemential path so that you can use
-
-```
+```python
 import voluemential.meshgen
 ```
-
 directly.
diff --git a/contrib/meshgen11_dealii/build.sh b/contrib/meshgen11_dealii/build.sh
index c2e72f6..5cf490f 100755
--- a/contrib/meshgen11_dealii/build.sh
+++ b/contrib/meshgen11_dealii/build.sh
@@ -9,10 +9,10 @@
 ## to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 ## copies of the Software, and to permit persons to whom the Software is
 ## furnished to do so, subject to the following conditions:
-## 
+##
 ## The above copyright notice and this permission notice shall be included in
 ## all copies or substantial portions of the Software.
-## 
+##
 ## THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 ## IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 ## FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
@@ -25,22 +25,20 @@
 
 set -e
 
-mkdir -p build
-cd build
-cmake ..
-make
-cd ..
+cmake -Bbuild -DCMAKE_BUILD_TYPE=Release
+cmake --build build --verbose
 
-echo Module built:
-echo ${PWD}/build/meshgen.so
+echo 'Module built:'
+echo "${PWD}/build/meshgen.so"
 
+outfile=$(realpath ../../volumential/meshgen_dealii.so)
 if [ -f build/meshgen.so ]; then
-  cp build/meshgen.so ../../volumential/meshgen_dealii.so
+  cp build/meshgen.so "${outfile}"
 elif [ -f build/meshgen.dylib ]; then
-  cp build/meshgen.dylib ../../volumential/meshgen_dealii.so
+  cp build/meshgen.dylib "${outfile}"
 else
   echo "Something went wrong. Build failed."
   exit 1
 fi
 
-echo Library copied to volumential path.
+echo "Library copied to '${outfile}'."
diff --git a/contrib/meshgen11_dealii/meshgen.cpp b/contrib/meshgen11_dealii/meshgen.cpp
index 6f3d15d..9ecf545 100644
--- a/contrib/meshgen11_dealii/meshgen.cpp
+++ b/contrib/meshgen11_dealii/meshgen.cpp
@@ -605,6 +605,7 @@ py::tuple make_uniform_cubic_grid(int q, int level, int dim,
     return make_uniform_cubic_grid_details<3>(q, level);
   } else {
     std::cout << "Dimension must be 1,2 or 3." << std::endl;
+    return py::tuple();
   }
 }