Nial, I found you need to run your cmd prompt as administrator before running b2 in order for the sym links to work correctly, otherwise you end up with hard links and the process fails 9 times out of 10. At least that is what I found on Win 8.1, -Matt
From: Niall Douglas <s_sourceforge <at> nedprod.com> Subject: b2 headers is unreliable on 1.56 on Windows Newsgroups: gmane.comp.lib.boost.devel Date: 2014-07-30 15:49:37 GMT (8 hours and 40 minutes ago)
Anyone else found that b2 headers in 1.56 randomly misses things to hard link on Windows? If you run it four or five times it eventually hard links everything through monte-carlo, but it is a bit annoying.
Niall
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