If you don't find anything, I would start by writing C/C++ functions to replace all the perl built-ins used. This is a very very complicated project IMO.
Hashes, if not basically all variables, will have to be the product of some function, as will regex's. I do not think any kind of "find and replace" strategy will work very well in the end: you should investigate
lexing and parsing if you are not already familiar with the topic. This might give you the general idea, read supplementary to something else:
http://www.intergate.com/~halfcountplus/CBCP/parsing.html
(there's some simple examples in C of how a language parser works, based on the "Dragon Book" stuff mentioned by almut; fascinating and fun -- good luck!)
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