I wonder if there might be some remaining interest in liblemon. The
Debian Med team who introduced it into Debian does not need it any more
for any of its packages. It seems it us orphaned upstream. I'd be
willing to keep the package alive if someone might provide a patch for
/<<BUILDDIR>>/liblemon-1.3.1+dfsg/lemon/maps.h:193:36: error: non-type template parameters of class type only available with '-std=c++2a' or '-std=gnu++2a'
as reported in bug #925749 but otherwise I'll ask ftpmaster for removal.