if (!sv_derived_from(PL_patchlevel, "version"))
(void *)upg_version(PL_patchlevel);
if ( vcmp(sv,PL_patchlevel) > 0 )
- DIE(aTHX_ "Perl v%_ required--this is only v%_, stopped",
+ DIE(aTHX_ "Perl v%"SVf" required--this is only v%"SVf", stopped",
vstringify(sv), vstringify(PL_patchlevel));
RETPUSHYES;