Hello,
I've uploaded the 64-bit porting of AvP to the AROS Archives. It's based mainly of the old AROS 32-bit version and still uses SDL v1.2, however it has been updated to the latest public release, although it has very few changes compared to those very old forks. Also I've fixed a couple issues that I believe affected the 32-bit version as well as MorphOS porting: several sounds weren't played because of a wrong path and it seems SDL v1.2 needs additional code to manage VBlank delay, otherwise on very fast machines it messed up with internal timings and animations. Fixed a crash occurred often during switching to full screen, too, it looked likely an issue of SDL v1.2 implementation on AROS 64-bit - it didn't happen on hosted AROS and natively on Ubuntu.