PERL_CALLCONV void Perl_sv_vcatpvf_mg(pTHX_ SV* sv, const char* pat, va_list* args);
PERL_CALLCONV void Perl_sv_catpv_mg(pTHX_ SV *sv, const char *ptr);
PERL_CALLCONV void Perl_sv_catpvn_mg(pTHX_ SV *sv, const char *ptr, STRLEN len);
PERL_CALLCONV void Perl_sv_catsv_mg(pTHX_ SV *dstr, SV *sstr);
PERL_CALLCONV void Perl_sv_setpvf_mg(pTHX_ SV *sv, const char* pat, ...)
PERL_CALLCONV void Perl_sv_vcatpvf_mg(pTHX_ SV* sv, const char* pat, va_list* args);
PERL_CALLCONV void Perl_sv_catpv_mg(pTHX_ SV *sv, const char *ptr);
PERL_CALLCONV void Perl_sv_catpvn_mg(pTHX_ SV *sv, const char *ptr, STRLEN len);
PERL_CALLCONV void Perl_sv_catsv_mg(pTHX_ SV *dstr, SV *sstr);
PERL_CALLCONV void Perl_sv_setpvf_mg(pTHX_ SV *sv, const char* pat, ...)