Merge pull request #5779 from danston/Installation-macos_guide_fix-danston

MacOS Qt5 Guide Update

Author: lrineau

Documentation/doc/Documentation/Usage.txt

@@ -166,12 +166,17 @@ if no debugging is intended. Users should thus run:
     cd CGAL-\cgalReleaseNumber/examples/Triangulation_2
     cmake -DCGAL_DIR=$HOME/CGAL-\cgalReleaseNumber -DCMAKE_BUILD_TYPE=Release . # we are here using a release tarball
 
-Note that the package Qt on brew is "keg-only", which means it cannot be "linked" with brew.
-You will have to specify the Qt5_DIR by hand to cmake, using something like
+The package Qt5 on brew is "keg-only", which means it is not "linked" with brew.
+In order to link against Qt5, you need to run:
 
-    -DQt5_DIR=/usr/local/opt/qt/lib/cmake/Qt5
+    brew link qt@5
 
-where '/usr/local/` is actually your current brew installation directory.
+After that, you will have to specify the Qt5_DIR by hand to cmake, using something like
+
+    -DQt5_DIR=/usr/local/opt/qt5/lib/cmake/Qt5
+
+where '/usr/local/` is actually your current brew installation directory. Check this directory
+to be sure where the Qt5 is placed on your machine.
 
 \subsection usage_configuring_cmake_gui Specifying Missing Dependencies