adding extra installation tips, fixes #74 and fixes #77

docs/astronify/install.rst

@@ -27,6 +27,22 @@ We recommend installing `homebrew` (https://brew.sh) and then running::
 
   brew install portaudio portmidi libsndfile liblo
 
+Still having issues?
+^^^^^^^^^^^^^^^^^^^^
+If you are still unable to install `astronify` (or `pyo`) via `pip`,
+it's possible `pip` is looking for them in the wrong spot, depending on
+how you've installed other packages in your envionrment.  If so, try
+adding the following flags to your shell of choice, open a new
+terminal, and then run `pip install astronify` again::
+
+  # Example for .cshrc
+  setenv CFLAGS '-I/opt/homebrew/include/'
+  setenv LDFLAGS '-L/opt/homebrew/lib/'
+
+  # Example for .bashrc
+  export CFLAGS="-I/opt/homebrew/include/"
+  export LDFLAGS="-L/opt/homebrew/lib/"
+
 Linux
 ~~~~~
 We recommend installing the following with apt-get::