diff --git a/CMakeLists.txt b/CMakeLists.txt
index 502ca29..61aeffd 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -48,7 +48,7 @@ if (APPLE)
 endif()
 
 ## ###################################################################
-## Dependencies 
+## Dependencies
 ## ###################################################################
 
 # --- Python
@@ -59,7 +59,7 @@ if (WIN32)
   set(Python3_FIND_REGISTRY LAST)
 endif()
 
-find_package (Python3 COMPONENTS Interpreter Development NumPy REQUIRED)
+find_package (Python3 3.9 EXACT COMPONENTS Interpreter Development NumPy REQUIRED)
 include_directories(${Python3_INCLUDE_DIRS})
 
 # --- Libraries
@@ -102,4 +102,4 @@ endif()
 add_subdirectory("src/cpp")
 add_subdirectory("src/wrapper")
 
-install_share("share" "lpy")
\ No newline at end of file
+install_share("share" "lpy")
diff --git a/conda/conda_build_config.yaml b/conda/conda_build_config.yaml
index 05379a8..a5f597f 100644
--- a/conda/conda_build_config.yaml
+++ b/conda/conda_build_config.yaml
@@ -18,4 +18,4 @@ MACOSX_SDK_VERSION:        # [osx and x86_64]
   - '10.12'                # [osx and x86_64]
 pin_run_as_build:
   boost: x.x
-  openalea.plantgl: x.x
\ No newline at end of file
+  openalea.plantgl: x.x
diff --git a/conda/meta.yaml b/conda/meta.yaml
index 454c326..504351c 100644
--- a/conda/meta.yaml
+++ b/conda/meta.yaml
@@ -27,21 +27,20 @@ requirements:
     - binutils_impl_linux-64           # [linux]
     - {{ compiler('cxx') }}
     - python x.x
-    - cmake 
+    - cmake
     - pkg-config                        # [linux]
     - make                              # [unix]
     - menuinst                          # [win]
   run:
     - python x.x
     - setuptools
-    - {{ pin_compatible('openalea.plantgl', max_pin='x.x') }} 
+    - {{ pin_compatible('openalea.plantgl', max_pin='x.x') }}
     - boost x.x
     - pyqt
     - ipython
-    - qtconsole
+    - qtconsole-base
     - jupyter_client # <6
     - pyopengl
-    - pyqglviewer >=1.3
     - jsonschema
 
 app:
diff --git a/conda_qt6/README.md b/conda_qt6/README.md
new file mode 100644
index 0000000..143d66e
--- /dev/null
+++ b/conda_qt6/README.md
@@ -0,0 +1,2 @@
+to build do:
+`mamba build -c gnomon -c dtk-forge6 -c conda-forge conda_qt6/ `
diff --git a/conda_qt6/bld.bat b/conda_qt6/bld.bat
new file mode 100644
index 0000000..005ceac
--- /dev/null
+++ b/conda_qt6/bld.bat
@@ -0,0 +1,16 @@
+:: Working Dir
+mkdir build
+cd build
+
+:: Build
+cmake -G "NMake Makefiles" -DCMAKE_INSTALL_PREFIX=%LIBRARY_PREFIX% -DCMAKE_BUILD_TYPE=Release -DPython3_EXECUTABLE=%PYTHON% -LAH ..
+if errorlevel 1 exit 1
+nmake
+if errorlevel 1 exit 1
+nmake install
+if errorlevel 1 exit 1
+
+:: Install Python Files
+cd ..
+%PYTHON% setup.py install
+if errorlevel 1 exit 1
diff --git a/conda_qt6/build.sh b/conda_qt6/build.sh
new file mode 100644
index 0000000..5bd82c6
--- /dev/null
+++ b/conda_qt6/build.sh
@@ -0,0 +1,75 @@
+#!/bin/bash
+
+if [[ -d build ]]; then
+    rm -rf build
+fi
+mkdir build
+cd build
+
+if [ `uname` = "Darwin" ]; then
+    SYSTEM_DEPENDENT_ARGS=(
+        "-DCMAKE_OSX_SYSROOT=${CONDA_BUILD_SYSROOT}"
+   )
+    export LDFLAGS="-undefined dynamic_lookup ${LDFLAGS}"
+else
+    SYSTEM_DEPENDENT_ARGS=(
+        "-DOPENGL_opengl_LIBRARY=${BUILD_PREFIX}/${HOST}/sysroot/usr/lib64/libGL.so"
+        "-DOPENGL_glx_LIBRARY=${BUILD_PREFIX}/${HOST}/sysroot/usr/lib64/libGL.so"
+    )
+fi
+
+export SYSTEM_DEPENDENT_ARGS
+
+echo
+echo "****** CMAKE"
+which cmake
+echo 'CONDA_BUILD_SYSROOT:' $CONDA_BUILD_SYSROOT
+echo
+echo "****** ENV"
+env
+
+echo
+echo "****** CMAKE CONFIG"
+
+cmake -DCMAKE_INSTALL_PREFIX=${PREFIX} \
+      -DCMAKE_PREFIX_PATH=${PREFIX} \
+      -DCMAKE_BUILD_TYPE=Release  \
+      -DPython3_EXECUTABLE=${PYTHON} \
+       ${SYSTEM_DEPENDENT_ARGS[@]} \
+      -LAH ..
+
+echo
+echo "****** LPY CONFIG"
+cat $SRC_DIR/src/openalea/lpy/__version__.py
+
+echo
+echo "****** COMPILE"
+make -j${CPU_COUNT}
+echo "****** INSTALL CXX LIB"
+make install
+
+echo
+echo "****** INSTALL PYTHON LIB"
+cd ..
+echo "PYTHON:" ${PYTHON}
+
+#echo "** PYTHON CALL"
+#export PYTHONPATH=${PREFIX}/lib/python${PY_VER}/site-packages/
+${PYTHON} setup.py install --prefix=${PREFIX}
+
+#cp -r share `${PYTHON} -c "import os, openalea.lpy as lpy ; print(os.path.dirname(lpy.__file__))"`/..
+
+echo
+echo "****** CHECK PYTHON LIB"
+
+# To check if Python lib is not in the dependencies with conda-forge distribution.
+# See https://github.com/conda-forge/boost-feedstock/issues/81
+if [ `uname` = "Darwin" ]; then
+    export LDD='otool -L'
+else
+    export LDD='ldd'
+fi
+
+echo `${PYTHON} -c "import openalea.lpy.__lpy_kernel__ as lpy ; print(lpy.__file__)"`
+
+echo "****** END OF BUILD PROCESS"
diff --git a/conda_qt6/conda_build_config.yaml b/conda_qt6/conda_build_config.yaml
new file mode 100644
index 0000000..aca02d5
--- /dev/null
+++ b/conda_qt6/conda_build_config.yaml
@@ -0,0 +1,21 @@
+cdt_name: cos7              # [linux]
+python:
+  - 3.9
+numpy:
+  - 1.22
+cxx_compiler:
+  - gxx                        # [linux]
+  - clangxx                    # [osx]
+  - vs2019                     # [win]
+compiler_version:
+  - 11                         # [osx]
+  - 11.2.0                     # [linux]
+cxx_compiler_version:
+  - 11                         # [osx]
+  - 11.2.0                     # [linux]
+MACOSX_DEPLOYMENT_TARGET:  # [osx]
+  - '10.14'                # [osx]
+MACOSX_SDK_VERSION:        # [osx and x86_64]
+  - '10.14'                # [osx and x86_64]
+CONDA_BUILD_SYSROOT:   # [osx]
+  - /Users/ci/Desktop/MacOSX-SDKs/MacOSX10.12.sdk # [osx]
diff --git a/conda_qt6/icon_64x64.png b/conda_qt6/icon_64x64.png
new file mode 100644
index 0000000..8349291
Binary files /dev/null and b/conda_qt6/icon_64x64.png differ
diff --git a/conda_qt6/meta.yaml b/conda_qt6/meta.yaml
new file mode 100644
index 0000000..98437c3
--- /dev/null
+++ b/conda_qt6/meta.yaml
@@ -0,0 +1,59 @@
+#{% set version = "2.7.2" %}
+{% set data = load_setup_py_data() %}
+
+package:
+  name: openalea.lpy
+  version: {{ data.get('version') }}
+
+source:
+  path: ..
+
+about:
+  home: https://github.com/openalea/lpy
+  license: Cecill-C
+  summary: L-Py is a simulation software that mixes L-systems construction with the Python high-level modeling language.
+
+build:
+  preserve_egg_dir: True
+  number: 2
+requirements:
+  host:
+    - python
+    - setuptools
+    - openalea.plantgl>=3.20
+    - qt6-main=6.5
+  build:
+    - {{ compiler('cxx') }}
+    - cmake >=3.20.0
+    - pkg-config                        # [linux]
+    - make                              # [unix]
+    - menuinst                          # [win]
+  run:
+    - python
+    - setuptools
+    - {{ pin_compatible('numpy',    max_pin='x.x') }}
+    - {{ pin_compatible('openalea.plantgl', max_pin='x.x') }}
+    - {{ pin_compatible('boost',            max_pin='x.x.x') }}
+    - pyside6
+    - ipython
+    - qtconsole-base
+    - jupyter_client # <6
+    - pyopengl
+    - jsonschema
+
+app:
+  entry: lpy
+  summary: Plant simulation software
+  icon: icon_64x64.png
+
+test:
+  requires:
+    - nose
+  imports:
+    - openalea.lpy
+  source_files:
+    - test/
+    - share/
+  commands:
+    - nosetests -v -I test_predecessor_at_scale.py -I test_ui.py [unix]
+    - nosetests -v -I test_predecessor_at_scale.py -I test_ui.py -I test_axialtree.py -I test_successor_at_scale.py [win]
diff --git a/src/openalea/lpy/gui/lpyview3d.py b/src/openalea/lpy/gui/lpyview3d.py
index d325149..ed586a5 100644
--- a/src/openalea/lpy/gui/lpyview3d.py
+++ b/src/openalea/lpy/gui/lpyview3d.py
@@ -6,7 +6,13 @@
     ParentClass = QGLViewer
     hasPyQGLViewer = True
 except ImportError as e:
-    ParentClass = qt.QtWidgets.QOpenGLWidget
+    try:
+        from openalea.plantgl.gui.qt.QtWidgets import QOpenGLWidget
+        ParentClass = QOpenGLWidget
+        pass
+    except:
+        from openalea.plantgl.gui.qt.QtOpenGL import QOpenGLWidget
+        ParentClass = QOpenGLWidget
     print('Missing PyQGLViewer !!!!!! Unstable Lpy !!!!!!!!!')
     hasPyQGLViewer = False
 
diff --git a/src/openalea/lpy/gui/objectpanel.py b/src/openalea/lpy/gui/objectpanel.py
index 854eda7..1d10a7b 100644
--- a/src/openalea/lpy/gui/objectpanel.py
+++ b/src/openalea/lpy/gui/objectpanel.py
@@ -19,8 +19,8 @@
     NewOpenGLClass = True
     pass
 except:
-    from openalea.plantgl.gui.qt.QtOpenGL import QGLWidget 
-    QGLParentClass = QGLWidget 
+    from openalea.plantgl.gui.qt.QtOpenGL import QOpenGLWidget
+    QGLParentClass = QOpenGLWidget
     NewOpenGLClass = False