I was trying to install HTML::Parser with 5.8.0 on VMS 7.3 and it bombed out trying to find perl_root:[lib.vms_axp.CORE.5_8_0]fakethr.h, one of the default XS dependencies in the MM perldepend target. %MMS-F-GWKNOPRN, There are no known sources for the current target PERL_ROOT:[LIB.VMS_AXP.5_8_0.CORE]FAKETHR.H Looking at vms/descrip_mms.template in the Perl sources, it seems to only conditionally install fakethr.h for FAKETHREADED is set, whatever that means. As far as I can tell, FAKETHREADED is never defined. AFAIK there's nothing wrong with installing all the .h files into CORE. In fact, its somewhat detremental not to. The patch below fixes that (I think) by removing the "ifdef FAKETHREADED" condition from the fakethr.h copy target. The open problem is what ever happened to FAKETHREADED? How can it ever be defined? -- It's Airplane Glue sniffing time!