Now that GOG supports Linux, will Linux version of Pegasus Prime be added, since it exists already?
I'm buying it because it's in the flash sale. I hope they add GNU/Linux support soon.
At least in http://thejourneymanproject.com
/ they say the Linux version exists and gog.com is there too.
There is a source code and a full diff supplied in the GOG version, necessary to comply with GNU GPL. You can find it in 'docs/ScummVM Documentation'.
However it does not apply cleanly to current ScummVM 2.0.0. sources and the compilation process is rather peculiar due to absolutely idiotic hacks made to ScummVM by Presto team meant to restrict the binary to work only with this game. It should be relatively easy to restore core ScummVM functionality but I have neither the time nor patience to sift through that 560K diff.
This procedure on either contents of Source.zip or revision d04667e58a889e4744f36fb5797a69fa437a1abf should recreate PegasusPrime binary that is capable of running only this particular game if you place it in the main data directory (the one containing 'PP Data' and pdf files with manuals):
./configure --datadir=. --disable-all-engines --enable-engine=pegasus
strip --strip-unneeded PegasusPrime
Then, copy or symlink the binary to the main data directory and run it.