unique step for dependencies installation

.github/workflows/BuildMeshLab.yml

@@ -26,22 +26,10 @@ jobs:
       with:
         cache: true
         version: ${{ env.QT_VERSION }}
-    - name: Install Linux dependencies
-      if: runner.os == 'Linux'
-      run: |
-        bash scripts/${{ runner.os }}/0_setup_env.sh --dont_install_qt --dont_install_cgal_and_boost
-        #needed by qt 5.15 on linux
-        sudo apt-get install libxcb-icccm4-dev libxcb-image0-dev libxcb-keysyms1-dev libxcb-render-util0-dev libxcb-xinerama0-dev
-    - name: Install macOS dependencies
-      if: runner.os == 'macOS'
-      run: |
-        brew install llvm libomp cgal xerces-c
-        npm install -g appdmg
-    - name: Install Windows dependencies
-      if: runner.os == 'Windows'
+    - name: Install dependencies
       shell: bash
       run: |
-        choco install ccache ninja wget nsis
+        bash scripts/${{ runner.os }}/0_setup_env.sh --dont_install_qt --dont_install_cgal_and_boost
     - name: Setup env variables
       id: envs
       shell: bash

scripts/Linux/0_setup_env.sh

@@ -29,16 +29,18 @@ sudo apt-get update
 echo "=== installing mesa packages..."
 sudo apt-get install -y mesa-common-dev libglu1-mesa-dev
 
+echo "=== installing cmake, patchelf, gmp, mpfr and xcerces-c..."
+sudo apt-get install -y cmake patchelf libgmp-dev libmpfr-dev libxerces-c-dev
+
 if [ "$DONT_INSTALL_QT" = false ] ; then
     echo "=== installing qt packages..."
     sudo apt-get install -y qt5-default qttools5-dev-tools qtdeclarative5-dev
 else
     echo "=== jumping installation of qt packages..."
+    # libraries that qt requires in any case
+    sudo apt-get install -y libxcb-icccm4-dev libxcb-image0-dev libxcb-keysyms1-dev libxcb-render-util0-dev libxcb-xinerama0-dev
 fi
 
-echo "=== installing cmake, patchelf, gmp, mpfr and xcerces-c..."
-sudo apt-get install -y cmake patchelf libgmp-dev libmpfr-dev libxerces-c-dev
-
 # possibility to use always system libraries starting from ubuntu 20.04, since cgal is header only
 if [ "$DONT_INSTALL_CGAL_BOOST" = false ] ; then
     echo "=== installing cgal and boost..."

scripts/Windows/0_setup_env.sh

@@ -0,0 +1,33 @@
+#!/bin/bash
+# this is a script shell sets up a Windows environment where
+# MeshLab can be compiled, deployed and packaged.
+#
+# Run this script if you never installed any of the MeshLab dependencies.
+#
+# Requires: choco
+
+DONT_INSTALL_QT=false
+
+#checking for parameters
+for i in "$@"
+do
+case $i in
+    --dont_install_qt)
+        DONT_INSTALL_QT=true
+        shift # past argument=value
+        ;;
+    *)
+        # unknown option
+        ;;
+esac
+done
+
+choco install ccache ninja wget nsis
+
+if [ "$DONT_INSTALL_QT" = false ] ; then
+    echo "=== installing qt packages..."
+
+    choco install qt5-default
+else
+    echo "=== jumping installation of qt packages..."
+fi

scripts/macOS/0_setup_env.sh

@@ -6,11 +6,35 @@
 #
 # Requires: homebrew
 
-brew install libomp qt cgal xerces-c
+DONT_INSTALL_QT=false
+
+#checking for parameters
+for i in "$@"
+do
+case $i in
+    --dont_install_qt)
+        DONT_INSTALL_QT=true
+        shift # past argument=value
+        ;;
+    *)
+        # unknown option
+        ;;
+esac
+done
+
+brew install cmake libomp cgal xerces-c 
 npm install -g appdmg
 
-echo "export QTDIR=/usr/local/opt/qt" >> ~/.bash_profile
-echo "export PATH=$QTDIR/bin:$PATH" >> ~/.bash_profile
-echo "export LD_LIBRARY_PATH=/usr/local/opt/qt/lib:$LD_LIBRARY_PATH" >> ~/.bash_profile
-echo "export PKG_CONFIG_PATH=/usr/local/opt/qt/lib:$PKG_CONFIG_PATH" >> ~/.bash_profile
-. ~/.bash_profile
+if [ "$DONT_INSTALL_QT" = false ] ; then
+    echo "=== installing qt packages..."
+
+    brew install qt
+
+    echo "export QTDIR=/usr/local/opt/qt" >> ~/.bash_profile
+    echo "export PATH=$QTDIR/bin:$PATH" >> ~/.bash_profile
+    echo "export LD_LIBRARY_PATH=/usr/local/opt/qt/lib:$LD_LIBRARY_PATH" >> ~/.bash_profile
+    echo "export PKG_CONFIG_PATH=/usr/local/opt/qt/lib:$PKG_CONFIG_PATH" >> ~/.bash_profile
+    . ~/.bash_profile
+else
+    echo "=== jumping installation of qt packages..."
+fi