`java.lang.UnsatisfiedLinkError` on Mac OS for LWJGL 2 natives

[SpaceWalkerRS]

Fabric Loom 1.4.1 Fabric Loader 0.14.22

When setting up a development environment for Minecraft versions prior to 17w43a (which is the first version to use LWJGL 3), running the game results in a crash due to the following error:

Minecraft has crashed!
net.fabricmc.loader.impl.FormattedException: java.lang.UnsatisfiedLinkError: Can't load library: <project root>/.gradle/loom-cache/natives/1.7.2/liblwjgl.dylib
    at net.fabricmc.loader.impl.FormattedException.ofLocalized(FormattedException.java:63) ~[fabric-loader-0.14.22.jar:?]
    at net.fabricmc.loader.impl.game.minecraft.MinecraftGameProvider.launch(MinecraftGameProvider.java:470) ~[fabric-loader-0.14.22.jar:?]
    at net.fabricmc.loader.impl.launch.knot.Knot.launch(Knot.java:74) [fabric-loader-0.14.22.jar:?]
    at net.fabricmc.loader.impl.launch.knot.KnotClient.main(KnotClient.java:23) [fabric-loader-0.14.22.jar:?]
    at net.fabricmc.devlaunchinjector.Main.main(Main.java:86) [dev-launch-injector-0.2.1+build.8.jar:?]
Caused by: java.lang.UnsatisfiedLinkError: Can't load library: <project root>/.gradle/loom-cache/natives/1.7.2/liblwjgl.dylib
    at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1831) ~[?:1.8.0_242]
    at java.lang.Runtime.load0(Runtime.java:810) ~[?:1.8.0_242]
    at java.lang.System.load(System.java:1088) ~[?:1.8.0_242]
    at org.lwjgl.Sys$1.run(Sys.java:70) ~[lwjgl-2.9.1-nightly-20131017.jar:?]
    at java.security.AccessController.doPrivileged(Native Method) ~[?:1.8.0_242]
    at org.lwjgl.Sys.doLoadLibrary(Sys.java:66) ~[lwjgl-2.9.1-nightly-20131017.jar:?]
    at org.lwjgl.Sys.loadLibrary(Sys.java:95) ~[lwjgl-2.9.1-nightly-20131017.jar:?]
    at org.lwjgl.Sys.<clinit>(Sys.java:112) ~[lwjgl-2.9.1-nightly-20131017.jar:?]
    at net.minecraft.client.Minecraft.getTime(Minecraft.java:2064) ~[minecraft-merged-c65ec6bb44-1.7.2-loom.mappings.1_7_2.layered+hash.630181723-v2.jar:?]
    at net.minecraft.client.main.Main.main(Main.java:36) ~[minecraft-merged-c65ec6bb44-1.7.2-loom.mappings.1_7_2.layered+hash.630181723-v2.jar:?]
    at net.fabricmc.loader.impl.game.minecraft.MinecraftGameProvider.launch(MinecraftGameProvider.java:468) ~[fabric-loader-0.14.22.jar:?]
    ... 3 more

I'm running Mac OS 12 (Monterey) on an Intel Mac. I get the same error if I run the game through ./gradlew runClient rather than through my IDE using the run configs Loom generated.

reproduction case

[modmuss50]

Does the .gradle/loom-cache/natives/1.7.2/liblwjgl.dylib file exist?

Might also be worth looking in Settings, Privacy and Security to ensure that MacOS is not blocking the natives.

[modmuss50]

After looking into this I can reproduce it, it seems that LWJGL is shipped as a .jnilib file, when it should be a .dylib.

Looking at MultiMC it renames the file: https://github.com/MultiMC/Launcher/blob/7450faaf1355af566515b9a156c704c6cd9a21ff/launcher/minecraft/launch/ExtractNatives.cpp#L65-L68 I will do the same.