Factor and simplify Makefile's and mpconfig, part 2.
diff --git a/unix/mpconfigport.h b/unix/mpconfigport.h
index b790106..8327641 100644
--- a/unix/mpconfigport.h
+++ b/unix/mpconfigport.h
@@ -10,6 +10,7 @@
 #define MICROPY_EMIT_INLINE_THUMB   (0)
 #define MICROPY_MEM_STATS           (1)
 #define MICROPY_ENABLE_REPL_HELPERS (1)
+#define MICROPY_ENABLE_LEXER_UNIX   (1)
 #define MICROPY_ENABLE_FLOAT        (1)
 
 // type definitions for the specific machine