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[Repost from 8/26/2019]
It appears that "luac" version 5.1.4 on Mac is 32-bit and thus won't run in Mac OS 10.15 (Catalina):
$ file `which luac`
/usr/local/bin/luac: Mach-O executable i386
$ luac -v
Lua 5.1.4 Copyright (C) 1994-2008 Lua.org, PUC-Rio
Possibilities for handling this:
1. Find a version compiled for 64-bit. (I haven't found such a version so far.)
2. Try to recompile the sources for 64-bit. (Ugh -- something will surely break, likely in a nasty way?)
3. Keep a virtual machine around running Mac OS 10.14.
4. Compile my plugins within my Windows virtual machines.
What are others doing?
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And why are you posting this on the Adobe LR Classic forum?
Shouldn't you be posting over on forum that deals with that compiler?
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Unfortunately, the Lightroom Classic SDK forum has been merged into this one, with its old posts tagged with the topic "SDK":
The post above was one of the ones in the window 8/22 - 9/11 that were lost in the transition.
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Jeffrey Friedl kindly provided "luac" (5.1.2) that he rebuilt for 64-bit:
https://www.dropbox.com/s/i5ud5u3jk2u20x1/luac?dl=0
LR is built with Lua 5.1.4, but since Jeffrey's plugins are among the most widely used, I think we can be pretty confident that his 5.1.2 "luac" works just fine.
Adobe indicated to me that they may include a 64-bit "luac" in the next major version of the SDK, coming out later this fall?