I believe this is required for dependencies to be calculated properly
h2 = embed.h form.h gv.h handy.h hv.h keywords.h mg.h op.h opcode.h
h3 = pad.h patchlevel.h perl.h perlapi.h perly.h pp.h proto.h regcomp.h
h4 = regexp.h scope.h sv.h unixish.h util.h iperlsys.h thread.h
-h5 = utf8.h warnings.h mydtrace.h
+h5 = utf8.h warnings.h mydtrace.h op_reg_common.h
h = $(h1) $(h2) $(h3) $(h4) $(h5)
c1 = av.c scope.c op.c doop.c doio.c dump.c gv.c hv.c mg.c reentr.c mro.c perl.c