On Apr 16, 2013, at 6:05 PM, Bruce Dubbs wrote:

I'm glad you figured this out.  I was wondering about it because I'd
expect a compile error if two #defines for the same token were made
without an #undef in between.

  -- Bruce

While we are on topic with Bison, it has come to my attention that Bison 2.7.1 is a bug fix stable release:

http://lists.gnu.org/archive/html/info-gnu/2013-04/msg00007.html

Anyway, it configured as stated in the book commands and with bison in the path it did already enable the definition. So, the book is still proper.

Sincerely,

Wiliam Harrington
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