diff --git a/CMakeLists.txt b/CMakeLists.txt
index fd170f3c2..bb1c608f4 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -60,7 +60,6 @@ if(NOT DEFINED PYTHONOCC_BUILD_TYPE)
 endif(NOT DEFINED PYTHONOCC_BUILD_TYPE)
 set(CMAKE_BUILD_TYPE ${PYTHONOCC_BUILD_TYPE} CACHE INTERNAL "Build type, immutable" FORCE)
 
-message(STATUS " ${CMAKE_CXX_FLAGS}") 
 set(BUILD_SHARED_LIBS ON)
 include_directories(${CMAKE_CURRENT_SOURCE_DIR})
 
@@ -120,7 +119,7 @@ message(STATUS "Python library release: ${Python3_LIBRARY_RELEASE}")
 ########
 # SWIG #
 ########
-find_package(SWIG 3.0.11 REQUIRED)
+find_package(SWIG 4.0.2 REQUIRED)
 include(${SWIG_USE_FILE})
 set(SWIG_FILES_PATH src/SWIG_files/wrapper)
 set(CMAKE_SWIG_FLAGS ${CMAKE_SWIG_FLAGS} -fvirtual -py3)
@@ -382,13 +381,6 @@ ${CMAKE_CURRENT_SOURCE_DIR}/src/Addons/Font3d.cpp
 
 swig_add_library(Addons LANGUAGE python SOURCES ${ADDONS_SOURCE_FILES} TYPE MODULE)
 swig_link_libraries(Addons ${OCE_MODEL_LIBRARIES} ${OCE_VISUALIZATION_LIBRARIES} Python3::Module)
-#if (APPLE)
-#  set_target_properties(${SWIG_MODULE_Addons_REAL_NAME} PROPERTIES COMPILE_FLAGS ${PYTHON_CFLAGS})
-#  set_target_properties(${SWIG_MODULE_Addons_REAL_NAME} PROPERTIES LINK_FLAGS ${PYTHON_LDFLAGS})
-#  swig_link_libraries(Addons ${OPENGL_LIBRARIES})
-#else(APPLE)
-#  swig_link_libraries(Addons ${PYTHON_LIBRARIES})
-#endif(APPLE)
 
 ################
 # Installation #
diff --git a/ci/conda/build.sh b/ci/conda/build.sh
index 85e90d80f..780b1b9ce 100644
--- a/ci/conda/build.sh
+++ b/ci/conda/build.sh
@@ -27,8 +27,8 @@ ninja
 ninja install
 
 # fix rpaths
-if [ $(uname) == Darwin ]; then
-    for lib in $(ls $SP_DIR/OCC/_*.so); do
-      install_name_tool -rpath $PREFIX/lib @loader_path/../../../ $lib
-    done
-fi
+#if [ $(uname) == Darwin ]; then
+#    for lib in $(ls $SP_DIR/OCC/_*.so); do
+#      install_name_tool -rpath $PREFIX/lib @loader_path/../../../ $lib
+#    done
+#fi
diff --git a/ci/conda/meta.yaml b/ci/conda/meta.yaml
index 0c56615c0..9889dc7e1 100644
--- a/ci/conda/meta.yaml
+++ b/ci/conda/meta.yaml
@@ -14,6 +14,7 @@ build:
 
 requirements:
   build:
+    - {{ compiler('c') }}
     - {{ compiler('cxx') }}
     - {{ cdt('libx11-devel') }}         # [linux]
     - {{ cdt('xorg-x11-proto-devel') }} # [linux]
@@ -21,7 +22,7 @@ requirements:
     - {{ cdt('libxi-devel') }}          # [linux]
     - ninja
     - cmake
-    - swig >=3.0.11
+    - swig >=4.0.2
 
   host:
     - python {{ python }}
@@ -38,6 +39,8 @@ test:
   imports:
     - OCC
     - OCC.Core.BRepPrimAPI
+    - OCC.Core.MeshDS
+    - OCC.Core.Tesselator
   requires:
     - pyqt >=5
     - mypy
diff --git a/conda-build.yml b/conda-build.yml
index 3b49f413c..656131081 100644
--- a/conda-build.yml
+++ b/conda-build.yml
@@ -30,15 +30,15 @@ jobs:
       displayName: 'Install OpenGL headers'
 
   # macOS ownership workaround and fix osx sdk
-  - ${{ if contains(parameters.vmImage, 'macOS') }}:
-    - bash: |
-        sudo chown -R $USER $CONDA && \
-        curl -o MacOSX10.9.sdk.tar.xz -L https://github.com/phracker/MacOSX-SDKs/releases/download/10.13/MacOSX10.9.sdk.tar.xz && \
-        tar xf MacOSX10.9.sdk.tar.xz && \
-        sudo mkdir -p /Applications/Xcode_12.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs && \
-        sudo mv -v MacOSX10.9.sdk /Applications/Xcode_12.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/ && \
-        ls /Applications/Xcode_12.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/
-      displayName: 'MacOS ownership workaround and installation of MacOSX10.9 sdk'
+  # - ${{ if contains(parameters.vmImage, 'macOS') }}:
+  #   - bash: |
+  #       sudo chown -R $USER $CONDA && \
+  #       curl -o MacOSX10.9.sdk.tar.xz -L https://github.com/phracker/MacOSX-SDKs/releases/download/10.13/MacOSX10.9.sdk.tar.xz && \
+  #       tar xf MacOSX10.9.sdk.tar.xz && \
+  #       sudo mkdir -p /Applications/Xcode_12.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs && \
+  #       sudo mv -v MacOSX10.9.sdk /Applications/Xcode_12.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/ && \
+  #       ls /Applications/Xcode_12.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/
+  #     displayName: 'MacOS ownership workaround and installation of MacOSX10.9 sdk'
  
   - bash: |
         conda config --set always_yes yes --set changeps1 no && \