PeTar fails to compile on recent Clang

[LourensVeen]

Describe the bug
PeTar fails to compile with Clang 19.

To Reproduce
See https://github.com/amusecode/amuse/actions/runs/26024686186/job/76494861443?pr=1260, which shows a ton of warnings and an error.

Logs
See link above, in particular this is the error:

In file included from interface.cc:1:
In file included from src/PeTar/src/petar.hpp:72:
In file included from src/PeTar/src/hard.hpp:9:
src/SDAR/src/AR/symplectic_integrator.h:329:25: error: no member named 'binarytree' in 'TimeTransformedSymplecticIntegrator<Tparticle, Tpcm, Tpert, Tmethod, Tinfo>'
  329 |             info = _sym.binarytree;
      |                    ~~~~ ^

Environment (please complete the following information):

• OS and version: macos 26
• Compiler: Clang 19

Additional context
May just need a -std=c++xx flag, or maybe there are updates upstream? Ideally the code would get cleaned up and converted to standard C++...