FEM: add standard path for gmsh on osx

src/Mod/Fem/femmesh/gmshtools.py

@@ -329,6 +329,12 @@ class GmshTools():
                     Console.PrintError(error_message)
                     raise GmshError(error_message)
                 self.gmsh_bin = gmsh_path
+            elif system() == "Darwin":
+                gmsh_path = "/Applications/Gmsh.app/Contents/MacOS/gmsh"
+                FreeCAD.ParamGet(
+                    "User parameter:BaseApp/Preferences/Mod/Fem/Gmsh"
+                ).SetString("gmshBinaryPath", gmsh_path)
+                self.gmsh_bin = gmsh_path
             else:
                 error_message = (
                     "No standard location implemented for your operating system. "