Found it ! I discovered a duplicate set of headers in /usr/local/include
and /usr/include, fixing this didn't fix the problem.
After several hours wondering what was wrong with the headers I found
there were two versions of libcppunit. This must have been a leftover of
the upgrade to 16.04 as it should surely have been deleted when replaced
by the updated version.
The older libcppunit-1.12 in /usr/lib/ and the newer, libcppunit-1.13
was in /usr/lib/x86_64-linux-gnu/ - why in different directory I have no
idea.
So the right headers were there but the wrong library was being selected
which is why it failed to build.
I deleted the older version and build progressed.
So what else has the version upgrade left lurking?
Mike
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