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--- ./src/include/ngram/ngram-randgen.h.orig	2012-02-13 07:45:55.000000000 -0700
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+++ ./src/include/ngram/ngram-randgen.h	2012-12-18 08:47:55.296955430 -0700
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@@ -35,6 +35,7 @@
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 #include <fst/fst.h>
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 #include <fst/randgen.h>
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+#include <unistd.h>
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 namespace ngram {
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