Is there any chance gog will/could convert the original starcraft to work on mac?

None at all. Blizzard own that do they not? And they don't sell games on GOG. But even if it were sold on GOG, they can only sell what the publisher gives them, if a Mac version doesn't exist, there's little they could do other than messing with third party options (such as Boot Camp, I guess?)

While Blizzard does not sell any game here in GOG, you should find a legit copy elsewhere to put into play this tutorial:

http://forums.macrumors.com/showthread.php?t=1277412

Isn't there a legit SC mac version?

Edit:

"ith the Mac OS version following a year later in 1999.[44]"

From

http://en.wikipedia.org/wiki/Starcraft#cite_note-44

I think you can buy Original Starcraft + Brood war on Blizzard store.

edited away a part that isn't true.

All Blizzard games are Windows/Mac compatible, disc versions have both installers and the digital download from Blizzard gives access to both.

This. Doesn't need converting!

Actually, my old copy of Starcraft only had the Windows version. When the disc broke (a millimetre or so from the inside broke off so the drive couldn't get hold of the disc to spin it), I bought a new copy that does have both versions. Also, my Warcraft II battle.net edition and my Warcraft II: Beyond the Dark Portal expansion are both Windows-only (well, DOS in the latter case), though my copy of Warcraft II: Tides of Darkness is Mac/DOS.

EDIT: That is Mac OS, not OS X. Blizzard did release OS X installers for Diablo II and Starcraft later, and the more recent patches were only released for OS X. Copies bought today are of course fully patched and OS X-ready out of the box.

At least in Starcraft's case you can register the key on Battle.net and download it from there.

I'm pretty sure it didn't accept my key though (or I couldn't read it properly, it was quite worn out, being a sticker pasted outside the jewel case).

Yeah, pretty sure Blizzard was well known for releasing Mac versions of all their games.

The OP is best served by finding some legit disks used and redeeming them on his Battle.net account.

All Starcraft keys will let you download the game from Blizzard's site after registering it. You get Windows and Mac OS X versions of the game after doing so. And Brood War!

I should know, I traded away tons of them here a while back. XD

Kalika, if you still have your original disc and key, go to Battle.net, register an account, and add your game key to it. You'll get a fully working OS X version then!

No, no. I may remember wrongly (it was a while ago, after all), but what I meant was that battle.net refused to accept the key for my old Starcraft copy (or, as I said, I couldn't correctly discern what the key was as the sticker couldn't be read and I may have copied it incorrectly). Instead I got a new one (they were cheap back then, I've no idea of the common price now), and registered that.

As a bonus, I have a version for classic Mac OS (on disc), something you don't get off battle.net (just OS X).

Actually, there is no way to run StarCraft and Broodwar nor Diablo II and LOD on modern Mac systems. They are old games and Blizzard never updated them for compatibility. This is especially infuriating for some users because the Battlechest boxes still claim Mac compatibility as they were never updated either!

Warcraft III and The Frozen Throne actually do have a binary that will run on both PPC and Intel Macs but unfortunately again, Blizzard never updated the installer for newer versions of OS X so it does not work. The only way to install it and then copy it over to a newer OS X is to have an older OS X (I forget which version is needed) to install it on and then copy it from. So this pretty much excludes all but the most determined.

It is true that Blizzard has always been great about supporting Macs with their games but it is also true they have not updated older games to keep running on newer Mac hardware and OS X releases sadly.

On a bright note, the current crop of Blizzard goodness: World of Warcraft, StarCraft II and Diablo III all run fine on modern Mac systems with the most recent version of OS X, Mountain Lion.

My solution to this problem as well as to facilitate playing many good old games without needing to reboot my system (bootcamp/Windows 7 which I also have setup for newer games) is to run Windows XP SP3 in a virtual machine with the Parallels software. Between this, Win 7 on bootcamp and native whenever possible there isn't anything I can't play on my Mac. :D