Was able to build fine using (optional)

Standard symbol tags


A symbol marked as optional can disappear from the library at any time
and that will never cause dpkg-gensymbols to fail. However, disappeared
optional symbols will continuously appear as  MISSING  in the diff in
each new package revision.  This behaviour serves as a reminder for the
maintainer that such a symbol needs to be removed from the symbol file
or readded to the library. When the optional symbol, which was
previously declared as MISSING, suddenly reappears in the next revision,
it will be upgraded back to the  “existing” status with its minimum
version unchanged.

This tag is useful for symbols which are private where their disappearance do 
not cause ABI breakage. For example, most of C++ template instantiations fall 
into this category. Like any
other tag, this one may also have an arbitrary value: it could be used to 
indicate why the symbol is considered optional.

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  corosync upgrade on 2018-01-02 caused pacemaker to fail

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