[Spot] Bug in version 2.8.6

Hi Spot Team, I am trying to compile Cyclist (cyclist-prover.org) against the latest version (2.8.6) of Spot, and I am getting an error. Cyclist is including spot/twa/twa.hh, and when compiling I get the following error: In file included from /home/cim/staff/uhac003/Academic/Resources/Spot/spot-2.8.6/install/include/spot/twa/acc.hh:28:0,                  from /home/cim/staff/uhac003/Academic/Resources/Spot/spot-2.8.6/install/include/spot/twa/twa.hh:27,                  from src/soundness/proof_aut.hpp:4,                  from src/soundness/proof_aut.c:1: /home/cim/staff/uhac003/Academic/Resources/Spot/spot-2.8.6/install/include/spot/misc/bitset.hh: In constructor ‘spot::bitset<N>::bitset(spot::bitset<N>::word_t)’: /home/cim/staff/uhac003/Academic/Resources/Spot/spot-2.8.6/install/include/spot/misc/bitset.hh:57:5: error: constexpr constructor does not have empty body      }      ^ In fact, I also get this error when trying to compile again versions 2.6.3 and 2.7.5 too. When I try to compile against version 2.5.3, I get the error that there is no such file spot/twa/twa.hh. Is this a bug, or has the API changed? If the latter, how should I update my code to use the newer versions? Thanks, Reuben -- Lecturer, Dept of Computer Science Royal Holloway, University of London Egham Surrey TW20 0EX Tel: +44 (0)1784 276827