USING_STD_NAMESPACE is now needed for all of the tesseract library, not just for training.

Ahmed Yarub Hani · Ahmed Yarub Hani · commit c37a5be4f810 · 2017-08-20T11:18:26.000-03:00
diff --git a/modules/text/src/precomp.hpp b/modules/text/src/precomp.hpp
@@ -48,6 +48,9 @@
 #include "text_config.hpp"
 
 #ifdef HAVE_TESSERACT
+#if !defined(USE_STD_NAMESPACE)
+#define USE_STD_NAMESPACE
+#endif
 #include <tesseract/baseapi.h>
 #include <tesseract/resultiterator.h>
 #endif
