Don't fail when an re2 prefix isn't found.#15

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anuraaga wants to merge 2 commits intoaxiak:masterfrom

anuraaga:master

Commits on Oct 14, 2012

Add /opt/local to re2 search path (it's the macports default)
anuraaga
committed
Just use an empty re2_prefix if none of the hardcoded ones are found - there's a good enough chance it'll work anyways.
anuraaga
committed