In this blog post on the Garry's Mod web-site by Garry Newman, he mentions:
• 13:46: Compiled fine on Windows! Something looks different.
• 13:55: Downloading the code to Mac & Linux, and attempting compile
• 14:19: The Mac build appears to have completed successfully!
• 14:39: And Linux has FINALLY compiled.. phew! Working on the depot to ship to Valve now!
Windows, Mac, and Linux. Errr... Linux?!?! Yep.
This post doesn't really need much more to say... There's some Phoronix readers that don't believe the Source Engine / Steam is coming to Linux while contrary to what Valve said last year, I've been saying it's coming, and then there are those that also trust the information just as the countless other Linux stories I've broken over the past seven years. If you've been following me on Twitter, I've also made some other remarks from time-to-time.
The one year anniversary of getting the Steam Linux client running (early screenshots in that article) is also coming up quickly.
This is my first time hearing about Garry's Mod on Linux, but it isn't too surprising since it's just a game mod and the current Source Engine is functional on Linux, so it should be easy. It is a bit surprising though to see Garry mention this Linux work on his public blog, but just wait a bit longer for the special day (there may be a Phoronix LAN party event at a München Augustiner biergarten too in celebration). This could also simply be in reference to a dedicated Linux server build of Garry's Mod, but regardless a big day is coming up.