ENH: initial support for building ParaView with QT5

- still issues with the required version
  eg, system has qt-5.5, but ParaView tries to use qt-5.6

etc/tools/ParaViewFunctions

@@ -307,23 +307,31 @@ addQtSupport()
         # parse -> "Using Qt version X.Y.Z in ..."
         QtVersion=$($qmake -query QT_VERSION)
 
-        # Split Major.Minor.Revision - could also use IFS hacking
-        set -- $(echo "$QtVersion" | sed -e 's/\./ /g')
+        case "$QtVersion" in
+        3.* | 4.[0-4]*)
+            # QT is too old
+            cat <<ERROR
+----
+Error: ${0##*/}
 
-        QtMajor=$1
-        QtMinor=$2
-
-        if [ $QtMajor -lt 4 -o $QtMajor -eq 4 -a $QtMinor -lt 5 ]
-        then
-            echo "*** Error: Qt version provided < 4.5"
-            echo "***     Please use the -qmake option to specify the location of a version of Qt >= 4.5"
-            echo "***     e.g."
-            echo "***         -qmake /usr/local/qt-4.6.2/bin/qmake"
-            echo "***         -qmake $installBASE/qt-4.6.2/bin/qmake"
+QT version ($QtVersion) provided < 4.5
+Please use the -qmake option to specify the location of a newer QT version
+For example,
+    ... -qmake /usr/local/qt-4.6.2/bin/qmake
+    ... -qmake $installBASE/qt-4.6.2/bin/qmake
+----
+ERROR
             exit 1
-        fi
+            ;;
+
+        5.*)
+            # QT4 is the default, must specify QT5 explicitly
+            addCMakeVariable "PARAVIEW_QT_VERSION:STRING=5"
+            ;;
+        esac
     else
-        echo "*** Error: cannot find qmake either at \$QMAKE_PATH or in current \$PATH"
+        echo "Error: cannot find qmake either at \$QMAKE_PATH or in current \$PATH"
+        echo
         exit 1
     fi
 }