* Use a proper namespace.

* Optimise header file usage a bit.
* Compile the parser as C++.

src/libexpr/nixexpr.cc

@@ -1,11 +1,14 @@
 #include "nixexpr.hh"
 #include "derivations.hh"
-
+#include "util.hh"
 
 #include "nixexpr-ast.hh"
 #include "nixexpr-ast.cc"
 
 
+namespace nix {
+    
+
 string showPos(ATerm pos)
 {
     ATerm path;
@@ -332,3 +335,6 @@ string showValue(Expr e)
     /* !!! incomplete */
     return "<unknown>";
 }
+
+ 
+}