mega65 Yes, Open ROMs has moved to KickAssembler completely (but from the logs I can see that some old version is being compiled) and does not need any submodules anymore (but requires Java now to run the KickAssembler).
The build system has changed since then - to build the newc65.rom file type 'make build/newc65.rom' (or 'make all' if you want all the builds). On my development branch you will find pre-built file (with release date and number embedded in ROM) in 'bin' subdirectory (this change is not merged yet).
Be warned, however - this ROM has a problem under XEMU, once we try to print a character in the top-right corner of the screen it damages screen memory and crashes. Reason unknown yet, the bug does not reproduce under VICE (I'm curious if this happens on a real Mega65 too...). Unfortunately, the startup banner from Retrofan (default for Mega65 build) does exactly this - I think I'll change it temporarily until the problem is resolved, so the ROM is at least usable under XEMU. Hypothesis: we might accidentally trigger one of the Mega65 extended opcodes.
spasskl Ophis needs Python 2.x only (not JRE), no Open ROMs version from the past required both Ophis and KickAssembler.
Unfortunately, I will be rather busy for the upcoming few days and I can't look into this right now.