Apache 2.0.46 and PHP 4.3.2 (bison)

I am trying to install PHP 4.3.2 with Apache 2.0.46. I compiled/installed Apache just fine, but I can't get PHP installed. When I run the configure script, it says

configure: warning: You will need bison if you want to regenerate the PHP parsers.

What is bison, and where can I get it?

 

 

 

 

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