build it with a newer version of packages

Author: charles-l

c-lexer.scrbl

@@ -184,7 +184,7 @@ Putting it all together, we get the final module file:
 Our lexer can be used in the following manner
 (though it generally isn't used on its own - we'll add the parser next):
 
-@(define ev (make-code-eval #:lang "racket" #:allow-for-require `(,(string->path "c-lexer.scrbl"))))
+@(define ev (make-code-eval #:lang "racket"))
 @(ev '(require "c-lexer.scrbl"))
 
 @code-examples[#:lang "racket" #:context #'here #:eval ev]{

c-parser.scrbl

@@ -36,7 +36,7 @@ First we'll include the necessary libraries
 
 Then, we'll write the @tt{numbers} rule.
 
-@(define ev (make-code-eval #:lang "racket" #:allow-for-require `(,(string->path "c-lexer.scrbl"))))
+@(define ev (make-code-eval #:lang "racket"))
 @(ev '(require br-parser-tools/yacc))
 @(ev '(require br-parser-tools/lex))
 @(ev '(require "c-lexer.scrbl"))