update README

README

@@ -3,18 +3,14 @@ PREREQUISITES
 
 This version is known to compile with:
 
- - Coq 8.5 beta 3
- - SCons 2.0
+ - Coq 8.5
+ - Ssreflect 1.6
+ - Autosubst 1.4
  
 BUILDING INSTRUCTIONS
 ---------------------
 
-Say "scons" to build the full library, or "scons some_module.vo" to just 
-build some_module.vo (and its dependencies).
-
-In addition to common Make options like -j N and -k, SCons supports some 
-useful options of its own, such as --debug=time, which displays the time 
-spent executing individual build commands.
-
-scons -c replaces Make clean
+Run the following commands to build the full development:
 
+  ./configure
+  make