adding note to readme to build lua separately

Readme.txt

@@ -8,6 +8,9 @@ sudo apt-get install libusb-1.0-0-dev
 
 make:
 gcc -I include inlretro.c -o inlretro -lusb-1.0
+or just run make unix from host folder.
+As noted in windows instructions below, lua must be built first
+-cd host/source/lua, make o a, then make from host/source
 
 run:
 ./inlretro
@@ -83,6 +86,15 @@ So that might help if you have similar issues...
 	
 Now host app can be built from windows command prompt command make when in host directory
 
+Currently setup to compile lua separate from host app.  Need to get better at writing makefiles..
+But whatever it works and saves ~12sec of compile time with current setup.
+-go to host/source/lua
+-make o a
+-go back to host
+-make
+This way lua is compiled separately using it's provided make file.
+make clean still deletes lua object files, so this process must be reperformed if cleaned.
+
 FIRMWARE:
 Download and Install WinAVR
 http://www.webring.org/l/rd?ring=avr;id=59;url=http%3A%2F%2Fwinavr%2Esourceforge%2Enet%2Findex%2Ehtml