They do have "general" purpose glue that'll glue pvc and abs together.
I had to cobble together some plumbing when my grey/black drain fell off during a trip..
Though I imagine after a while they'll crack one another since they have different expansion rates.
I imagine you can find pipe and plumbing supplies at most RV stores that have a repair shop..
Heck, I found nearly all the ABS parts I needed except some pipe hence the PVC in Small town Nebraska!..
My worse problem is connecting PVC/ABS and HDPE tanks outlets, in fact I need to take it apart and try again and fix a leak on one tank..