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diff --git a/src/if_perl.xs b/src/if_perl.xs
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index c69ed9ef1..2cf78b901 100644
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--- a/src/if_perl.xs
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+++ b/src/if_perl.xs
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@@ -40,7 +40,7 @@
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 /* Work around for perl-5.18.
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  * Don't include "perl\lib\CORE\inline.h" for now,
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  * include it after Perl_sv_free2 is defined. */
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-#ifdef DYNAMIC_PERL
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+#if (PERL_REVISION == 5) && (PERL_VERSION >= 18)
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 # define PERL_NO_INLINE_FUNCTIONS
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 #endif
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@@ -402,14 +402,14 @@ static bool (*Perl_sv_2bool)(pTHX_ SV*);
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 static IV (*Perl_sv_2iv)(pTHX_ SV*);
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 static SV* (*Perl_sv_2mortal)(pTHX_ SV*);
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 # if (PERL_REVISION == 5) && (PERL_VERSION >= 8)
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-static char* (*Perl_sv_2pv_flags)(pTHX_ SV*, STRLEN*, I32);
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+static char* (*Perl_sv_2pv_flags)(pTHX_ SV*, STRLEN* const, const U32);
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 static char* (*Perl_sv_2pv_nolen)(pTHX_ SV*);
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 # else
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 static char* (*Perl_sv_2pv)(pTHX_ SV*, STRLEN*);
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 # endif
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 static char* (*Perl_sv_2pvbyte)(pTHX_ SV*, STRLEN*);
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 # if (PERL_REVISION == 5) && (PERL_VERSION >= 32)
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-static char* (*Perl_sv_2pvbyte_flags)(pTHX_ SV*, STRLEN*, I32);
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+static char* (*Perl_sv_2pvbyte_flags)(pTHX_ SV*, STRLEN* const, const U32);
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 # endif
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 static SV* (*Perl_sv_bless)(pTHX_ SV*, HV*);
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 # if (PERL_REVISION == 5) && (PERL_VERSION >= 8)
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@@ -710,7 +710,7 @@ S_POPMARK(pTHX)
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 # endif
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 /* perl-5.34 needs Perl_SvTRUE_common; used in SvTRUE_nomg_NN */
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-# if (PERL_REVISION == 5) && (PERL_VERSION >= 34)
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+# if (PERL_REVISION == 5) && (PERL_VERSION == 34)
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 PERL_STATIC_INLINE bool
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 Perl_SvTRUE_common(pTHX_ SV * sv, const bool sv_2bool_is_fallback)
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 {
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@@ -737,7 +737,7 @@ Perl_SvTRUE_common(pTHX_ SV * sv, const bool sv_2bool_is_fallback)
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 # endif
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 /* perl-5.32 needs Perl_SvTRUE */
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-# if (PERL_REVISION == 5) && (PERL_VERSION >= 32)
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+# if (PERL_REVISION == 5) && (PERL_VERSION == 32)
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 PERL_STATIC_INLINE bool
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 Perl_SvTRUE(pTHX_ SV *sv) {
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     if (!LIKELY(sv))