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--- xdrawchem-1.9.9/xdrawchem/application.cpp.compile	2005-11-16 12:01:55.000000000 +0900
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+++ xdrawchem-1.9.9/xdrawchem/application.cpp	2012-08-01 15:57:31.545768999 +0900
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@@ -14,6 +14,7 @@
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 #include <stdio.h>
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 #include <stdlib.h>
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 #include <errno.h>
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+#include <unistd.h>
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 using std::cout;
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 using std::endl;