Are you sure? Looking at the source of the message, I think you can

3531     SAVECOPFILE_FREE(&PL_compiling);

3532     CopFILE_set(&PL_compiling, tryrsfp ? tryname : name);

3533     SvREFCNT_dec(namesv);

3534     if (!tryrsfp) {

3535         if (PL_op->op_type == OP_REQUIRE) {

3536             const char *msgstr = name;

3537             if(errno == EMFILE) {

3538                 SV * const msg

3539                     = sv_2mortal(Perl_newSVpvf(aTHX_ "%s:   %s", 
+msgstr,

3540                                                Strerror(errno)));

3541                 msgstr = SvPV_nolen_const(msg);

3542             } else {

3543                 if (namesv) {                   /* did we lookup 
+@INC? */

3544                     AV * const ar = GvAVn(PL_incgv);

3545                     I32 i;

3546                     SV * const msg = sv_2mortal(Perl_newSVpvf(aTH
+X_ 

3547                         "%s in @INC%s%s (@INC contains:",

3548                         msgstr,

3549                         (instr(msgstr, ".h ")

3550                          ? " (change .h to .ph maybe?)" : ""),

3551                         (instr(msgstr, ".ph ")

3552                          ? " (did you run h2ph?)" : "")

3553                                                               ));

3554                     

3555                     for (i = 0; i <= AvFILL(ar); i++) {

3556                         sv_catpvs(msg, " ");

3557                         sv_catsv(msg, *av_fetch(ar, i, TRUE));

3558                     }

3559                     sv_catpvs(msg, ")");

3560                     msgstr = SvPV_nolen_const(msg);

3561                 }    

3562             }

3563             DIE(aTHX_ "Can't locate %s", msgstr);

3564         }
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strace is fine, but since it already gives an error message, maybe it should also include Strerror(errno))?