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diff -up ppl-1.1/interfaces/Prolog/GNU/gprolog_efli.hh.orig ppl-1.1/interfaces/Prolog/GNU/gprolog_efli.hh
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--- ppl-1.1/interfaces/Prolog/GNU/gprolog_efli.hh.orig	2014-04-29 17:25:21.639273848 -0300
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+++ ppl-1.1/interfaces/Prolog/GNU/gprolog_efli.hh	2014-04-29 17:25:30.757274198 -0300
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@@ -45,14 +45,14 @@ extern bool Prolog_has_unbounded_integer
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   integer value representable by a Prolog integer.
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   Holds zero otherwise.
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 */
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-extern long Prolog_min_integer;
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+extern PlLong Prolog_min_integer;
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 /*!
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   If \p Prolog_has_unbounded_integers is false, holds the maximum
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   integer value representable by a Prolog integer.
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   Holds zero otherwise.
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 */
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-extern long Prolog_max_integer;
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+extern PlLong Prolog_max_integer;
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 /*!
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   Performs system-dependent initialization.