README: add deps

README.md

@@ -1,14 +1,23 @@
 
+# sqlfun
+
 An SQL parser, generated from Bison (Yacc) and Flex (Lex).
 
 Original version - most of the work - comes from John Levine's
 Flex & Bison book published by O'Reilley.
 
-Example usage:
+## Example usage:
 
 	$ echo "SELECT a.name,b.address FROM people ORDER BY name;" | ./sql
 
-Standard GNU autotools building instructions:
+## Requirements
+
+1. GNU Flex
+2. GNU bison
+3. GNU autotools (autoconf, automake, etc.)
+4. A C compiler
+
+## Standard GNU autotools building instructions:
 
 	$ ./autogen.sh
 	$ ./configure