Now for some reason it seems I'm unable to do a rebuild.
Deleted the original source tree and extracted again from .tar
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@make_ext "Sys$Disk:[]miniperl.exe" "MMK"
Making attrs (dynamic)
%SYSTEM-F-ROPRAND, reserved operand fault at PC=0010109D, PSL=03C00004
%TRACE-F-TRACEBACK, symbolic stack dump follows
module name routine name line rel PC abs PC
0010109D 0010109D
0017F5D3 0017F5D3
UTIL Perl_safesysmalloc 49367 0000001C 0003E868
UTIL Perl_savepvn 50074 00000016 0003F56E
GV Perl_gv_init 49418 000001E7 0007D387
GV Perl_gv_fetchmeth 49513 0000009D 0007D665
GV Perl_gv_fetchmeth 49566 00000341 0007D909
GV Perl_gv_fetchmeth 49566 00000341 0007D909
GV Perl_gv_fetchmeth 49566 00000341 0007D909
GV Perl_gv_fetchmeth 49566 00000341 0007D909
GV Perl_gv_fetchmeth 49566 00000341 0007D909
GV Perl_gv_fetchmethod_autoload 49741 0000014C 0007DC48
GV Perl_gv_fetchmethod 49665 00000014 0007DAF4
PP_HOT S_method_common 52451 0000035A 0009EFEA
PP_HOT Perl_pp_method_named 52353 00000048 0009EC78
RUN Perl_runops_standard 49321 00000041 000DC2C9
PERL S_run_body 51293 00000107 00017F4B
PERL perl_run 51212 0000006A 00017C2E
MINIPERLMAIN main 49383 00000091 0000C0A1
%MMK-F-ERRUPD, error status %X10000454 occurred when updating target DYNEXT
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Still investigating what has been changed.
--Saku