add notes about --slow flag and apple silicon

INSTALL.rst

@@ -116,8 +116,21 @@ flags:
     - the cmake prefix path for use with FIND_PACKAGE, FIND_PATH, FIND_PROGRAM, or FIND_LIBRARY macros 
 
   * - ``--build-type BUILD_TYPE``                 
-    - change the CMAKE_BUILD_TYPE                                                                      
+    - change the CMAKE_BUILD_TYPE     
 
+  * - ``--data-model-version``        
+    - sets the data model version number
+
+  * - ``--code_coverage``
+    - Enable code coverage analysis using gcov/lcov
+
+  * - ``--fast``
+    - Will try to compile from assembly, if possible (default). This is faster than compiling from source.
+
+  * - ``--slow``
+    - Will NOT try to compile from assembly, if possible. This is slower as it must compile from source. 
+      **This is required to build on Apple Silicon**
+
   * - ``-D VAR``                                  
     - set environment variable(s).                                                                    
 

install.py

@@ -192,7 +192,7 @@ def main():
                         default='Release')
 
     parser.add_argument('--data-model-version', dest='data_model_version', default=None,
-                        help='Sets the core version number.')
+                        help='Sets the data model version number.')
 
     parser.add_argument('-D', metavar='VAR', action='append',
                         help='Set enviornment variable(s).')
@@ -210,7 +210,8 @@ def main():
     parser.add_argument('--slow', dest='fast',
                         action='store_false', help="Will NOT try to compile "
                         "from assembly, if possible. This is slower as it "
-                        "must compile from source.")
+                        "must compile from source. **This is required to "
+                        "build on Apple Silicon**")
 
     args = parser.parse_args()
     # modify roots as needed