Cryptic Boost.Build error (help required!)

From: John Maddock (jz.maddock_at_[hidden])
Date: 2019-10-08 12:47:43

Can anyone see what's wrong here: 
https://github.com/boostorg/regex/issues/89 ?

The reduced test case is:

|./b2 -sICU_PATH="/opt/some/path" 
-sICU_LINK="-L/opt/some/path/lib/x86_64-linux-gnu -licuuc -licudata 
-licui18n" toolset=gcc-8 -n --with-filesystem --with-log Many thanks, John. |

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